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Sounds like your ground source is weak, the gauges don't work with the lights on because the illumination circuit is using all or most of the ground, I ran into the same problem on the identical vehicle. Restore a proper ground to the cluster and it may cure it. (I put a separate ground lead from the dash to the ground circuit on the back of the cluster).

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Q: Why does the instrument panel stop operating correctly when you turn the lights on in a 81 Chevy c-10 truck?
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