bought a new sensor today. hooked it up to the harness and put power on the system. (sensor not installed in block). Found that if it trick the sensor by holding it near anything steel voltage reads 12. move the sensor away from steel and voltage reads 2.5. Stuck old sensor on plug and same results... hmmm. seems old sensor is ok.
I am curious to hear what MSD finds cause there is not a whole lot else that could be wrong. MSD has an easy hook up... power , ground and tach. all other wires are pre-fab in a harness with factory plugs. harness was working ok last year.