Review on ACECAR Universal Dual System 3.5 Inches HUD - Head Up Display for Car with OBD2 GPS Interface, Speedometer, Engine RPM, OverSpeed Warning, Mileage Measurement, Water Temperature - Suitable for All Vehicles by Michael Hudson

damn cute! Exactly. reads your car's computer. It CANNOT display false information. It's real time. I bought this in place of an aftermarket temp sensor for my Scion xB which only has the .idiot. lights up when overheating, some tips - You don't just need a USB cable if you use it for OBD codes, you only need an OBD connector cable. It comes with a nice double sided sponge tape to attach it to the dash but I only taped it first to try that it comes with a reflector. Thing for your windshield but I haven't used it, it reflects well on my windshield *** Press the IN button on the rocker to change OBD mode. I ONLY set the water temperature. It lights up when you start the car, shows voltage for 3 seconds, then real time time. I would pay 100€ for it. And you can move it to multiple cars, so it's a good investment.