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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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