first gotta say i love having this thing being able to play around with diffrent settings reading any codes and having an extra set of gauges right at the tips of your fingers but only have one problem with it my truck is sitting on 36s and i try to calibrate it to the tire size and a wierd number comes up like 2236 it has the thirty six right but not sure why the 22 is there also shows the speed as being ten miles under what im really going any know enough about theses to help me out

 

You need to input the circumference of the tire in mm. The 36 does not stand for the tire diameter.