'69 Cuda temp gauge not working

4spdragtop said

You may already know the fuel gauge has voltage regulator inside it that "runs" the rest of . That may be an issue as well.

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I do know that. I bought an IVR to replace that component while I’m at it.

So I disconnected the temp sender and grounded it. Temp gauge didn’t move, so I suspect the gauge is bad. Curiously when I grounded the temp wire, the oil gauge pegged full. I imagine that’s because both of these gauges are powered by that internal voltage regulator?