Review on 🚗 Hud Display: iKiKin Car HUD Head Up Display 3.5inch Digital GPS Speedometer for All Cars and Trucks by Edward Perez

I have to say that this speedometer/compass works very well. I was initially frustrated with the inaccurate readings at high speed. It was fine up to 80 km/h, but at 100 km/h it read 62. At 70 km/h it showed 73 and at 80 km/h 85. The instructions said something about adjusting the speed, but didn't say what to do. I learned through trial and error and was able to be 100% accurate. This can help you when you need to adjust the speed. one). When you are in the car, the device is on and the GPS is connected, enter setup mode by pressing and holding the IN setup button until you get into setup mode. 2). The first setting parameter is the speed. You'll know you're in it when 107.3 appears on the display). If your unit reads faster than the dash speedometer, like mine does at 80 mph, it reads 85. You turn the dial left or right to raise 107 to 108 or higher, or similarly lower to 106 or lower. In my case, I dropped it from 107 to 102.4 because it was 5 mph too fast. Now hold the IN setup button again until 0 and compass appear and you have corrected the speed error. I hope this helps someone avoid having to send it back out of frustration.