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 - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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