Seems to me if one pulls the belt pulley gearbox, a three position, spring-loaded, center-resting off-on-off switch with levers linked to, or bearing on, the ends of all the rails, could be installed.
Of course there are other ways using magnetic pick-up or maybe some optical sensor.
Personally, I would have to go to a Power Transmission or Automation Specialist dealer and let them shuffle through their thousands of catalogs. Or maybe it's as easy as a google search. It's also likely that such a switch might be found in an auto or truck salvage yard for handling AC controls or any number of functions in a modern vehicle. I dunno. My newest vehicle was built in 1998 and is a low optioned 1-ton Diesel.
Just dreaming, Jim, and I am not even an electronics geek. Not saying your's won't work but magnetic pickup sounds cool and there is no contact. All three rails would have to "make" before a signal could get to the starter solenoid's "S" terminal.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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