Review on ELING Universal GPS Speedometer Odometer with COG, Trips, & Backlights - 85mm 12V 24V - 80MPH / 120KM/H by Jeremy May

Very easy to install and no fuss! As long as you place the antenna somewhere with a clear view of the sky, it will work. Not sure about parking garages and tunnels yet, but I'll find out. Also the "mode" button (changes the mileage from trip 1 to kilometer 2) and the "light color change" buttons should be in the front, they're in the back, so if you need to change something, you'll have to put your hand under the plate . Otherwise, I am very satisfied!