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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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