Thanks to all for the input. I was trying to verify mph vs rpm in my truck.When I take the spped up to 50,55 my tack is reading in the range of 2500 to 2800. I usually try to keep under 3000 but it will takemore and not hesitate-----however the engine noise picks up quite a bit. I will do the download on cell as suggested------Happy Motoring to all!----Dave