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 Josh Dyer

After reading so many reviews I decided to give it a try. It works so well that I really like it. I use it in GPS mode and in the beginning the speed was a bit behind the dash. When I got to 30 it just read like a dash, but when I got to 60 it read like 65. I followed the instructions that came with it and it was pretty easy to set up. The instructions say to unplug the car if you don't use it often as it will still get battery power even when the car is off. I just prefer to turn it off every time I'm not using the car, but other than that I love my speedo!