Quote:
Originally Posted by ljmauricio
Everything works properly except the jumpy tach when right turn signal on. I am going to address the grounding of the cluster as discussed in this thread. BTW, I have seen a post somewhere that recommends running an independent grounding wire from the cluster to a good chassis ground.
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Based upon my interpretation of the schematics the tach isn't supposed to be grounded in the same loop as the turn signals. In fact it has no independant ground at all, the two wires to the tach consist of a 12V+ and a wire from the engine speed sensor. I would look for an extra grounding that maybe someone added to try and fix a problem in the past that may be causing this jumping.