1986 C10 Voltmeter

[Camacorn]

I've done quite a bit of searching, and even read some other posts on the subject, but for the life of me I can not seem to find out why my Voltmeter gauge is not working. The gauge itself is fine, I've already tested it, but I'm not quite sure what to try next to get it working.

Any help would be appreciated.

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PS; instead of making a new thread, does anyone know where I can get the proper temp sending unit? I've heard that most of them put out the wrong temperature unless you get the right one.