Temp & fuel gauges - what am I overlooking?

Uncle Bob said

Voltage is the same as it always had been - variable.

I keep testing and all I'm doing is convincing myself there's nothing wrong in the cluster.

I get an open reading checking the old temp sender. I probed the center stud and the body. Heating it didn't seem to have any effect.

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Ok.

What are the voltage readings you are getting?

You should be getting 5 volts or somewhere close.

No 5 volts, gauges wont work.

Also, something 67Dart273 mentioned.

Bad terminals in the IVR socket.

Take the IVR out of the socket completely and using jumper wires with alligator clips, temporarily wire the IVR back into the circuit .

Just to be sure your meter is working ok, measure the battery voltage. Should be 12-12.5 volts