If you do decide on Mega-squirt or another electronic ignition option I have the 36-1 trigger wheels for the M116/M117's.

DIY Autotune and Digikey have the sensors in stock.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now