KAOLALI Head Up Display, OBD2 + GPS Dual System Digital Speedometer, Universal Auto Car Speedometer with OverSpeed Alarm, Voltmeter Warning, Water Temperature

Having been worried about if it works with niche model like Subaru WRX, and apparently it works right away. Display response is fast, so far no interference with the car engine, and the menu recognized Subaru and offers Subie specific data fields. No disconnect at all for 30 mins of test drive so far.The form factor is well thought and it fits nicely at the corner of window so it does not block view, unlike those HUD type speedometer.If there is anything to worry about, is the material durability - it is of some relatively thin plastic casing and the OBD2 cable bears some flimsy connectors (especially on the device side). If it lasts for the next 12 months I probably should consider to buy one more as spare. 😅Recommended.

Used this on my Alfa Romeo 2013 (940), using the OBDII port under the steering wheel. Works perfectly well, speed is accurate as well the temperature and other stuff that I was able to test.It has a on/off switch. On my car it switches itself off after about 5 seconds. When you start the car it automatically starts. I was worried about the size of the scree, but it is easy to read. You configure it as you wish, even rotate the screen. Easy to adjust parameters like MPH, time etc. It remembers them all.So far no battery drain.It could have been made stronger but it will do the job. It looks cool and I am happy with its performance.Recommended.I will update if there is any battery drain.

If like me, your vehicle doesn't have a traditional temperature gauge as lots of vehicles today, this is literally an engine saver. I bought after a friend overheated his engine, he had a Vauxhall Vivaro van which only lets you know once it has overheated. His repair bill was in excess of £3000! Not long after installing this device I was able to catch a situation when I had a leaking radiator and saved myself a costly repair bill. It takes 15 mins to fit and just plugs into your vehicles OBD socket. Lots of other valid information is available to including a Compass. Highly recommended piece of kit.

I found the similar devices, particularly in this price range, to look too big, and too colourful. This is nice and discrete, low key, even stylise. It works perfect, a lot more data is viewable than advertised. Long and short term fuel trims, IAT, and more that I still need to get my head around.

If you persevere with the set up you may get it to work as you wish. Instructions are pathetic. Very flimsy on/ off switch, but seems to have auto turn off if left long enough. I bought it because it is the only one available which looks right in my car. Fits very neatly on corner of dash.

Great value and service. This is a fantastic bit of kit. My honda jazz has no temperature gauge and this is the solution. Plug and go reader displays speed, coolant temperature, battery voltage and loads of other options. Puts your mind at ease knowing youcan keep an eye on things.

Excellent product and very easy to install.

Abit fiddly to get about menus but once set up it’s great, I read a lot of reviews about it draining battery and on my Mercedes it hasn’t as it turns off, UPDATE: after having it six months it hasn't let me down, one thing that is annoying is you can change the rev below 6k, I use it on a diesel so have max rpm of 4k, in the settings you can change the voltage it turns on and off, so i have set it so when the voltage is above 12 it turns on and when its below or at 12 it turns off, I use it as a boost gauge and it updates surprisingly fast, you can also range the request rate which also makes it faster