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I JUST BOUGHT SOME 6 bt cummins engines and after looking at them i noticed on the front harmonic balancer - pulley etc. it has 2 180 degree slots cut in the balancer and a sending unit bolted to the timming cover corresponding with the slots. is this an electronic tach sensor setup ? engine is 1 st gen 6bt, 12 valve. if this is a tach setup sure would work good on a 4 bt also.
bob
bob