Car Gadgets for Old Cars
10 Fixes for Missing Tech
Our #1 pick is the Krunia 9.26" Wireless CarPlay Screen. A 2005 to 2017 car usually lacks CarPlay, Bluetooth, a backup camera and tire-pressure warnings. These 10 gadgets add each one for roughly $10 to $140, with no dealer visit.
How we picked: we shortlist by Amazon Best Seller rank and number of ratings, then compare published specs. We don’t test these products hands-on.
By Jamilur Rahman, Founder & Editor · Updated November 5, 2026
- Owner reviews checked
- Features side by side
- Quick & easy compare
- Smarter purchase
The short answer
An older car usually misses CarPlay or Android Auto, Bluetooth audio, a backup camera, fast USB-C charging and tire-pressure warnings, and you can add most of it with plug-in gadgets and no dealer visit. The best single upgrade is the Krunia 9.26-inch portable CarPlay screen: it plugs into the 12V socket and gives you maps, music, calls and a backup camera view on one screen. The free fix is a phone on a mount running Google Maps, and until you buy a tire monitor you can check pressure at any gas station air pump.
Check your model year first. Every car since the 1996 model year has an OBD-II port, so a code reader fits almost any car you will keep. Tire-pressure monitoring became required on new cars from the 2008 model year, so a 2005 to 2007 car may have no warning light. CarPlay arrived in cars from about 2016, and backup cameras became required on new vehicles built from May 2018, so most older cars have neither. Then match the gadget to your dash. A car with only a radio or a tape deck can get Bluetooth from the Nulaxy KM18 FM transmitter. A car with an aux jack should use the UGREEN aux receiver, which sounds cleaner and costs about $10. If you want a rear view with no screen in the dash, the AUTO-VOX solar camera needs no wiring. If the check-engine light is on, BlueDriver tells you why before a shop charges for the diagnosis. We left Bluetooth cassette adapters out because the car versions we found were weakly rated.
Skip the Krunia if your car already has a touchscreen with Bluetooth, or if all you want is music and calls: a $10 aux receiver does that for far less. Skip it too if your dash has no flat spot where a screen sits clear of the windshield, or if your 12V socket is dead. A phone mount and Google Maps cover navigation for about $25. How we picked: we chose one gadget per problem, checked every listing on Amazon.com, and read what each listing says and what owners report. We did not test them hands-on, and we only kept listings from the real brand with plenty of reviews. Checked November 2026.
Compare them side by side
Everything that matters, in one table. Swipe to see all 10.
| Product | Best overall · Fixes: no CarPlay Krunia 9.26" Wireless CarPlay Screen Portable CarPlay and Android Auto screen |  Fixes: mystery check-engine light BlueDriver Bluetooth OBD2 Scan Tool Bluetooth OBD2 scanner |  Fixes: no Bluetooth audio Nulaxy KM18 Bluetooth FM Transmitter Bluetooth FM transmitter |  Fixes: no crash record Vantrue E1 Lite Mini Dash Cam Mini front dash cam with GPS |  Fixes: Bluetooth through aux jack UGREEN Aux Bluetooth Receiver Aux Bluetooth receiver |  Fixes: nowhere to put your phone iOttie Easy One Touch Signature Dash Mount Dash and windshield phone mount |  Fixes: slow phone charging Anker 323 52.5W Car Charger USB-C and USB-A car charger |  Fixes: backing up blind AUTO-VOX Solar Wireless Backup Camera Solar wireless backup camera, 5-inch monitor |  Fixes: no tire-pressure warning Tymate TM8 Tire Pressure Monitor Solar TPMS kit with 4 valve sensors |  Fixes: no blind spot warning Ampper Blind Spot Mirrors (2 Pack) Stick-on convex blind spot mirrors |
|---|---|---|---|---|---|---|---|---|---|---|
| BeastScore | 93 / 100 | 91 / 100 | 90 / 100 | 88 / 100 | 86 / 100 | 87 / 100 | 85 / 100 | 84 / 100 | 83 / 100 | 82 / 100 |
| Best for | Drivers whose car has no touchscreen and who want maps, music and calls on one dash screen. | Anyone with a 1996 or newer gas car who wants to know why the check-engine light is on before paying a shop. | Cars with a radio but no aux jack or Bluetooth, including tape-deck cars. | Drivers who want footage after a fender-bender or a dispute and only need the road ahead. | Cars with a 3.5mm aux jack and a USB port, where clean sound matters. | Anyone who navigates with Google Maps or Waze on a phone in a car with no screen. | Phones that drain faster than they charge with maps and Bluetooth running. | Cars built before the 2018 camera rule where you want a rear view without any wiring. | Cars from 2007 or earlier with no tire-pressure warning light. | Drivers of cars that predate blind-spot monitors who want a $10 fix. |
| Typical price (checked November 5, 2026) | $80–$100 | $90–$110 | $20–$25 | $90–$110 | $10–$15 | $20–$30 | $15–$20 | $120–$140 | $30–$40 | $8–$10 |
| Fixes | No CarPlay or Android Auto | Check-engine light and other warning codes | No Bluetooth, no aux jack | No crash or dispute record | No Bluetooth, but has an aux jack | No place to hold a phone for maps | Slow or missing USB-C charging | No rear view when reversing | No tire-pressure warning | Blind spots beside the car |
| Install | 12V plug-in, no wiring | Plugs into the OBD-II port | 12V plug-in, tune to an empty FM channel | 12V plug-in with included charger | Plugs into the aux jack | Suction to the dash or windshield | 12V plug-in | Plate-mounted camera, monitor in the 12V socket | Screw-on valve sensors, windshield display | Stick-on, no tools |
| Needs your phone | Yes, runs from your phone | Yes, BlueDriver app | Yes, over Bluetooth | Optional, Wi-Fi app | Yes, over Bluetooth | Yes, it holds the phone | No | No | No | No |
| Power source | 12V socket | From the car, no battery | 12V socket | 12V socket | USB port | None | 12V socket | Solar and battery camera, 12V monitor | Solar or USB display | None |
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BeastScore here is our overall rating out of 100, based on published specs and Amazon owner reviews. Prices change daily, so tap "View on Amazon" for today's price. We may earn a small commission, at no extra cost to you. Learn more
Why each one made the list
What each pick does best, where it falls short, and the typical Amazon price when we checked.
- 1. Best overall · Fixes: no CarPlay
Krunia 9.26" Wireless CarPlay Screen
BeastScore 93 / 100Typically $80–$100 on Amazon (checked November 5, 2026)This one fixes the most at once. A car with no screen gets wireless CarPlay and Android Auto, so maps, music and calls run from your phone on a 9.26-inch display. The listing says a waterproof backup camera is included and the screen switches to it when you reverse. It plugs into the 12V socket, so there is no dash work. Pick it over the cheaper gadgets if you want one purchase, not three. The catch: sound reaches your speakers over aux or FM, and FM can hiss in cities with crowded bands. Some older 12V sockets stay live with the engine off, so unplug it when parking for days.
Pros- One screen covers maps, music, calls and a backup view
- Plugs into the 12V socket with no wiring or trim removal
- Moves to your next car in a minute
Cons- Audio needs aux or FM, and FM can hiss in big cities
- Adds a screen and a cable to the dash
- Not for you if you only want music and calls: a $10 aux receiver does that
- 2. Fixes: mystery check-engine light
BlueDriver Bluetooth OBD2 Scan Tool
BeastScore 91 / 100Typically $90–$110 on Amazon (checked November 5, 2026)The check-engine light is the most common old-car scare, and a shop may charge to read it. BlueDriver plugs into the OBD-II port and sends the code to your phone with a plain-language explanation. The listing says you get repair reports matched to your VIN with no subscription, plus ABS and airbag codes on supported cars. Take it over cheap dongles that only show a code number. Install is plug-in. The catch: it reads and clears codes but fixes nothing, the listing covers gas cars from 1996 and select light-duty diesels, and some ports hide behind trim.
Pros- Explains each code and lists likely fixes for your car
- Plug-in install, with no subscription per the listing
- Also reads ABS, airbag and TPMS codes on supported cars
Cons- Does not fix anything, it only tells you what is wrong
- Costs several times more than a basic code reader
- Not for you if your car is older than 1996 or the light never comes on
- 3. Fixes: no Bluetooth audio
Nulaxy KM18 Bluetooth FM Transmitter
BeastScore 90 / 100Typically $20–$25 on Amazon (checked November 5, 2026)If your car has a radio but no aux jack, this is the cheapest way to add Bluetooth. It plugs into the 12V socket, you tune it to an empty FM channel, and your phone’s music and calls play through the car speakers. The 1.44-inch screen shows the channel, call info and your car battery voltage, a handy check on an old battery. It is one of the most-reviewed FM transmitters on Amazon. The catch: FM hisses or picks up stations in cities with crowded bands, so you may retune on trips. Skip it if your car has an aux jack: the UGREEN sounds cleaner.
Pros- Adds Bluetooth music and calls to any car with a radio
- Screen shows the channel and battery voltage
- Aux input and a card slot as backups
Cons- FM can hiss or drift in cities with crowded FM bands
- The listing text does not spell out charging speed, so check it first
- Not for you if your car has an aux jack: the UGREEN is cleaner
- 4. Fixes: no crash record
Vantrue E1 Lite Mini Dash Cam
BeastScore 88 / 100Typically $90–$110 on Amazon (checked November 5, 2026)An older car has no record of what happened, and that matters in a dispute. The E1 Lite is a small front camera that records 1080p with HDR and stamps GPS speed and location on the video. Wi-Fi lets you pull clips to your phone, and the listing says no subscription is needed. It runs from the included car charger, so install is plug-in. Pick it over a front-and-rear kit if you only need the road ahead. The catch: parking mode needs a hardwire kit sold separately, and a 12V socket that stays live with the engine off can leave the camera running, so test your socket.
Pros- Small enough not to block your view
- GPS speed and location on every clip
- Phone app over Wi-Fi with no subscription, per the listing
Cons- Front only, so no rear view
- Parking mode needs a separate hardwire kit
- Not for you if you drive a few short trips a week and park in a garage
- 5. Fixes: Bluetooth through aux jack
UGREEN Aux Bluetooth Receiver
BeastScore 86 / 100Typically $10–$15 on Amazon (checked November 5, 2026)If your car has a 3.5mm aux jack, skip the FM transmitter and use this. It plugs into the aux jack and takes power from a USB port. Sound travels over a wire, so there is no FM hiss, and the built-in microphone handles hands-free calls. The listing says it remembers up to five devices and reconnects when you start the car. Take it over the Nulaxy if you have the jack: it is simpler and costs about $10. The catch: it needs a USB power source, so a car with an aux jack but no USB port also needs a 12V charger, like the Anker pick below.
Pros- Wired audio, so no FM hiss or retuning
- Costs about $10
- Remembers five phones and auto-reconnects
Cons- Needs a USB port or a 12V charger for power
- Does nothing for a car with no aux jack
- Adds one more cable to the dash
- 6. Fixes: nowhere to put your phone
iOttie Easy One Touch Signature Dash Mount
BeastScore 87 / 100Typically $20–$30 on Amazon (checked November 5, 2026)This is the cheapest fix on the list. A phone on a mount running Google Maps or Waze does most of what a built-in screen does. The Easy One Touch holds the phone with arms that close when you press the phone into the trigger. The telescopic arm extends from 5 to 8 inches and pivots, so the map sits at eye level. Take it over a vent clip if your vents are weak or slanted. Install is just suction. The catch: suction cups can slip on a textured or sun-worn dash, and some states limit what you can stick on a windshield, so check yours.
Pros- Works one-handed: press the phone in and the arms close
- Long arm reaches 5 to 8 inches and pivots to eye level
- Fits phones and cases of different sizes
Cons- Suction can slip on textured or worn dashboards
- Some states restrict windshield mounts
- Not for you if you already have a screen: it adds nothing
- 7. Fixes: slow phone charging
Anker 323 52.5W Car Charger
BeastScore 85 / 100Typically $15–$20 on Amazon (checked November 5, 2026)Many older cars have only a 12V socket or one slow USB-A port, so a phone running maps and Bluetooth can drain faster than it charges. This Anker plugs into the 12V socket and adds a 30W USB-C port plus a 22.5W USB-A port. The listing says it takes an iPhone 14 Pro to 50% in about 25 minutes and monitors temperature. Pick it over the big 100W-plus chargers if you only charge phones: it is small and cheap. The catch: it will not charge a laptop, and a socket that stays live with the engine off keeps it powered. Unplug it if you park for days.
Pros- Fast 30W USB-C charging for modern phones
- Second USB-A port for a passenger or the UGREEN receiver
- Small enough to sit flush in most sockets
Cons- Too weak for a laptop
- Only two ports
- Not for you if your car already has a USB-C port
- 8. Fixes: backing up blind
AUTO-VOX Solar Wireless Backup Camera
BeastScore 84 / 100Typically $120–$140 on Amazon (checked November 5, 2026)Backup cameras only became required on new vehicles built from May 2018, so most older cars have none. This AUTO-VOX camera mounts on your license plate and sends video to a 5-inch monitor that plugs into the 12V socket. The listing says there is no wiring and no drilling, no connection to the reverse lights and a 2-minute install. A solar-assisted battery runs 3 to 4 months between charges. Take it over a wired kit if you do not want to pull trim. The catch: wireless video can lag or drop out, the range is about 52 feet, and the camera needs a USB-C top-up now and then.
Pros- No wiring: plate mount plus a 12V monitor
- Solar-assisted battery lasts 3 to 4 months per charge
- Waterproof camera rated IP69K
Cons- Priciest pick besides the screen
- Wireless video can lag or drop out
- Not for you if you already have the Krunia, which includes a camera
- 9. Fixes: no tire-pressure warning
Tymate TM8 Tire Pressure Monitor
BeastScore 83 / 100Typically $30–$40 on Amazon (checked November 5, 2026)New cars must have tire-pressure monitoring from the 2008 model year, so a 2005 to 2007 car or older may have no warning at all. The free fix is to check pressure at a gas station air pump once a month. If you want a warning instead, the Tymate TM8 puts a sensor on each valve stem and shows pressure and temperature on a color display on the windshield. The listing says it charges by solar or USB and sets up in about five minutes. The catch: the sensors screw on the outside, so a thief could unscrew them, and the listing recommends a metal valve stem.
Pros- Pressure and temperature for all four tires at a glance
- Solar or USB charging for the display
- No tools: sensors screw onto the valve stems
Cons- External sensors can be unscrewed or stolen
- The listing recommends metal valve stems
- Not for you if your car already has a factory TPMS light
- 10. Fixes: no blind spot warning
Ampper Blind Spot Mirrors (2 Pack)
BeastScore 82 / 100Typically $8–$10 on Amazon (checked November 5, 2026)Blind-spot warning lights are a new-car feature, but a pair of stick-on convex mirrors gives you a similar view for about $9. These Ampper mirrors come as a 2-piece pack with a swivel base, so you can aim each one. The listing says you clean the side mirror, press the mirror on hard and you are done in seconds. Take them over a blind-spot sensor kit, which usually means mounting sensors behind the bumper. The catch: convex glass shows cars smaller and farther away than they are, so you still need a head check, and they will not warn you with a light or a beep.
Pros- About $9 for a pair
- Install takes seconds and needs no tools
- Swivel base lets you aim each mirror
Cons- No light or beep, you still have to look
- Convex glass makes cars look farther away
- Not for you if your car already has blind-spot monitoring
All 10 compared, in one look
See every pick on one chart, or tap one to put it head to head with Krunia 9.26" Wireless CarPlay Screen. Ratings out of 10 are our estimates from published specs and Amazon owner reviews, not hands-on tests. Bigger shape = better.
- How much it fixesKrunia 9.26" Wireless CarPlay Screen · 9.6/10
- Easy installTie
- Fits old carsAnker 323 52.5W Car Charger · 9.6/10
- Daily useTie
- ValueTie
Which one should you buy?
Find your situation below. That's your pick.
- Your car has no touchscreen at all
- You want maps, music, calls and a backup view from one purchase
- The check-engine light is on or keeps coming back
- You want to know what a shop quote is really for
- Your car has only a radio or a tape deck
- You want Bluetooth music and calls for about $20
- You drive on busy roads or park on the street
- You want speed and location proof in a dispute
- Your car has a 3.5mm aux jack and a USB port
- You want the cleanest sound for the lowest price
- You already use Google Maps or Waze on your phone
- You want the cheapest way to see the map at eye level
- Your phone loses charge on long drives with maps on
- Your car has a 12V socket and no fast USB port
- You reverse into tight spots or a driveway often
- You want a rear view with no wiring
- Your car has no tire-pressure warning light
- You want all four tires on one display
- You change lanes on busy highways
- You want a fix that costs about $9
Krunia 9.26" Wireless CarPlay Screen
One plug-in screen that gives an old car CarPlay, Android Auto, navigation, calls and a backup camera view.
- Wireless CarPlay and Android Auto
- Backup camera included
- Plugs into the 12V socket
Quick tips before you buy
Plug in a charger, switch the car off and see if it stays lit. If it does, unplug gadgets when you park for days so they cannot drain the battery.
A mount plus Google Maps or Waze is the cheapest upgrade. Live with it for a week to learn what you actually miss before you spend $80.
OBD-II since 1996, tire-pressure monitoring from the 2008 model year, backup cameras on new cars from May 2018. Those dates tell you what your car already has.
An old battery struggles most with short trips and winter. If the car cranks slowly, test or replace the battery before adding gadgets that stay powered.
Quick answers
Can you add CarPlay to an old car?+
Yes. A portable CarPlay screen like the Krunia plugs into the 12V socket, sits on the dash and runs CarPlay or Android Auto from your phone with no wiring. Sound reaches your speakers over aux or FM. The other route is a new head unit, but the dash may need an install kit that costs $100 or more. If you only want maps, a phone on a mount running Google Maps is the cheapest fix.
How do you add Bluetooth to an old car?+
Match the gadget to your dash. If the car has an aux jack, use a Bluetooth aux receiver like the UGREEN, which costs about $10 and sounds cleanest. If it has only a radio, including a tape-deck car, use a Bluetooth FM transmitter like the Nulaxy KM18 in the 12V socket. Bluetooth cassette adapters exist, but we left them out because the car versions we found were weakly rated.
Can I add a backup camera to an older car?+
Yes. The easiest route is a wireless kit like the AUTO-VOX solar camera, which mounts on the license plate and sends video to a monitor in the 12V socket with no wiring. The Krunia screen also includes a camera. Wired kits need a cable run to the reverse lights. Backup cameras were only required on new vehicles built from May 2018, so most older cars have none.
Do FM transmitters work well?+
They work, with limits. Sound is a step below aux or Bluetooth, and in cities with crowded FM bands you may hear hiss or a stray station. Pick an empty channel near the bottom or top of the dial and retune when you travel. If your car has an aux jack, use an aux receiver instead.
What does an OBD2 scanner do?+
It plugs into the OBD-II port under the dash, which every car since the 1996 model year has, and reads the trouble code behind the check-engine light. A good one like BlueDriver explains the code, lists likely fixes, clears the light after a repair and shows live data. It does not fix anything, and one code can have several causes. Many auto parts stores will also read a code for free.
Will a dash cam drain my battery?+
Usually not. If it is plugged into a 12V socket that switches off with the ignition, the camera loses power when you turn the car off. Some older cars keep the socket powered all the time, and then a camera can keep running and slowly drain an old battery over days. To test, plug in a charger, switch the car off and see if it stays lit. If it does, unplug the camera when you park.
What should you skip when upgrading an old car?+
Skip no-name FM transmitters with no track record, cheap OBD dongles that only show a code number with no explanation, and cutting into wiring when a plug-in version exists. Also skip a head-unit swap if the dash needs a $100-plus install kit and you only want Bluetooth: a $10 aux receiver or a $20 FM transmitter does that job.
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