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Originally Posted by pawoSD
This goes back to an unanswered question I had posted in another thread, has anyone ever actually had the pickup over the crank fail? Mine is an 82 so would the overvoltage protection even be an issue? What else does the overvoltage protection protect....as everything else on my car works. I see they do sell replacement tach pickups, but I still wonder if they can even fail...or maybe be out of adjustment?  |
No, the pickup is a coil of wire with almost no current flowing in it, it generates a weak electrical pulse when the small metal (magnetic?) tip of the projection on the crank pulley passes by.
The cable to the pick up coil is something that can break though and I've seen that happen during an engine removal or swap
Usually the failure is in the tach amp module on the fender or in the case of the '85 diesels the EGR box in the car behind the glove box.