Review on Universal Car HUD Head Up Display With Digital GPS Speedometer, MPH/KM Acceleration Time, Compass, Altitude & Driving Distance Monitoring - Overspeed Alarm HD LCD Display For All Vehicles by Kevin Ballard

I got this for my bike because my speedo was way off. It works it does what it says it will do. But I found the instructions to be a bit confusing. And during the day could not see the display. In the dark worked great. It was 1 to 2 mph slower compared to my phone and my phone has never been wrong comparing to those this is your speed signs. So take this as you will. I am not bashing this just needs some tweaks and it could be a good product.