I'm in the process of installing a Pertronix on my '72. I have read so many conflicting wiring instructions it makes my head swim. One consistency, though, is don't leave your ignition on without the engine running or you canburn out the Pertronix. I can imagine a simple circuit, but I cannot design it. A relay that shuts off power to the Pertronix if it dees not sense an ingntion pulse within a minute or so. Resets with turn-off of ignition power. One of you geniuses out there can cesign it so it can be built for about $10, and save the rest of us the replacement cost several times over. How about it? BAM