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If so, The tach has never worked because it's a m110 to om617 engine swapped car.
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I dont quite understand, is the harmonic balancer from a diesel?
The diesel needs a groove cut in the pulley. The groove causes a disruption in the magnetic field which the pickup senses.
I mounted a (300d) tach in my 6.2 diesel Blazer (<- comes with a bracket for connecting a magnetic probe for timing & rpm). I fab'ed a bracket to mount the MB pickup. Worked like a charm, , , , ,
-c-