Installation was very easy. Here Are the data from the head up to the display of my Audi Q5 will be different. Up to 30 km, the tolerance is 2 km. From 30 km there are 4 km away. From 50 km there are 5 km away. At 70 km and more is 8 km away. :-( Fuel consumption also is wrong, according to display the Audi is 7 liters. On the Hud up is 30 liters. Otherwise, without reflective foil clearly visible. Unfortunately, I had to send the unit. Will try another if that Dan the values indicating more precisely