I did turn it to off set and it was already at 20 high setting ,then too probe , started Truck got 650 rpm and - 20 degrees. After reading instruction I may of had the probe hooked up before the battery connections , which in the fine print it tells you not to do. Hope that did not damage it. I did not take the RPM up to 2000. Just to verify the hook up of Pieso Clamp red wire to the little spring connection on clamp , black wire clip to groung engine or same injector line ( cylinder # 1 ) which i sanded paint off ? The magnet probe in the longer of the two tubes passenger side engine crank dampner , which i did not clean. I try agian make sure i clean everthing with alchol , hook up the Timing Meter to battery first , and rev to 2000 RPM . Sure hope it works. Thanks .