GPS Digital Speed Meter Speedometer HUD with MPH Speed Head Up Display for All Cars, USB Cable Plug & Play

The unit worksIt lags a little when changing speed and wants a clear sky but when maintaining speed it is accurate

The dang thing works awesome I didn't think it would keep such good track but yeah it updates quickly and speedometer is dead on if you're looking for a cheap way to put a speedometer on your motorcycle etc this is the way to go great product

Worked fine

My bike speedo is 19% fast and this is 7% fast so I didn't get anywhere by installing it. Not sure how you can make a GPS speedo inaccurate unless you do it on purpose. It is easy to install, though.

Cool for what it is and the price is good. Mine reads 5 mph off, but it's consistent at least.

Reads much faster than I am going. Display bounces a lot. I ordered one for about $30 that was adjustable and much steadier. I have no idea how you make a GPS speedo that is inaccurate unless you do it deliberately. I suspect this is the case because the more expensive one came from the factory set to be almost as much fast (107%) but it could be adjusted to match my cell phone speed app and my speedometer.

Our speedometer quit working so this has been a huge help in our daily driving

It works well, when it works. I got it for a 1991 Dodge Ram 250. When I hit a bump, it will shut off and then take a few minutes to restart and read speed.But over all it’s been good to know my speed.