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I finally sorted out my problems with the gauges - I took the speedometer housing off, and the gauge cluster as well. The old voltage regulator under the speedometer was defective, and I could never have gotten it off, and the new one installed with the wires without having the gauge cluster out of the way. The second issue I had was self inflicted - when I was reassembling the dash after getting the vinyl recovered, I installed one of the leads on the instruments backwards. The lugs on the back of the gauge clusters are not marked for hot or ground, and the electrical diagram isn't too clear on it. So I put the gauge cluster on the test bench and tested each gauge, and marked the back of the housing with a Sharpie
as to the color of wire and also which lug is hot. After reassembling the dash (again!!!) everything works as designed.
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