I thought my tach only worked sporadically but as I watch closer it begins working once the coolant temp gets up to 115 degrees. No idea how the sensor works could someone enlighten me?
Check the connection on the timing gear, your pickup for the tach is on ththe driver side. It is common for those wires to become frayed or loose there, could be that heat is affecting that.
It’s probably the tachometer sensor that’s on top of the IP gear tower. Mine did the same thing years ago. Wouldn’t be accurate when cold but would be good once engine warmed up.
A new sensor fixed that.
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