As I recall Petronix uses a magnetic pickup. I've installed several for myself and friends but that was many years ago.
There is a metal star that goes over the distributor shaft (where the cam lobes are that operated the points) with fingers corresponding to the number and location of the cylinders to be fired.
There is an electromagnetic pickup mounted where the points were mounted whose purpose is to "sense" the presence or absence of the fingers. As a finger passes the magnetic pickup it induces a pulse which is sent to the triggering switch, SCR or MOSFET and fires it. The switch stays on until the backswing off the coil pulse, of reverse polarity shuts it off if an SCR, MOSFET shuts off when the trigger disappears.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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