Clever anit-theft switches

Does anyone know if grounding the tach wire will work for GM-style HEI ignitions?


YES. On a side note, the interesting thing about GM HEI is that when the key is on, engine not running, HEI does NOT normally draw current through the coil as does points or the Mopar ECU, or the older Jeep electronic from the '70s

(My cousin went through two or three Jeep ECU it turned out he was listening to the radio, with key in "run" instead of accessory)