Chainsaw Repair

ABS sensors are 2 wire and read the tone ring without a power input. ABS sensors create a voltage signal...most generally an AC voltage.






crank sensors IIRC need external power to function, most are run on 5VDC. again IIRC crank sensors are generally 3 wire..... 5V reference, ground, signal wire. this may work the best if you can come up with a way to to provide the 5V reference voltage since the sensor is designed to only read a couple triggers in the 800-7000rpm range




I think what your system is measuring is the voltage spikes so an abs sensor sounds more like what you need and they just need a metal tab sticking out to provide a trigger which could easily be made without a tone ring. ABS sensor should provide a much cleaner signal than the gutted microphone but since ABS sensors are designed to multiple triggers i am not sure how irratic it would be with just one trigger and if the RPM would be sufficient  with one trigger to function correctly.

my quick math says an ABS sensor with a stock tone ring probably wont function at the RPM this thing will be doing. I came up with a tone ring having an average RPM of only 677 vs   your rig even if the tone ring was mounted on the jackshaft doing 1/4 the rpms of the saw it would still be doing 5-6 times the RPM that an ABS sensor is designed for. fewer triggers would effectively lesson the rpm that the abs sensor saw but at what cost to signal quality