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| Joined: | 07-15-2013 |
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So I'm wondering if I need to rebuild my tach.
Possible, but unlikely. When I did a Spiyda conversion on my tach, the tach internals looked very robust. What you described earlier sounds to me like a poor or intermittent electrical connection. The main culprit I have found over the years is the slide-on connectors that are used all over the place on these cars. Before going to messing with the tach internals I would check to make sure that the connections to the back of the tach are clean and tight. The connectors should be difficult to pull off. If not, try tightening them with a pair of pliers so it takes a bit of muscle to push them back on. If the connectors on the wire ends are tight enough, they should push through any oxidation on the spade connectors on the tach. To be safe, though, it is better to clean off the spade connectors with fine sand paper or steel wool. If possible, also check the wires going into the connectors. Normally these connectors do not move much, so the wires should be OK, but if they have been moved much for some reason, the wires could be loose or frayed in which case the connector needs to be replaced.