1. Measure resistance between back of instrument cluster and the body of the car and report back
2. Disconnect the fuel sender at the gas tank
3. Disconnect the temp sender at the intake
4. Disconnect the oil sender at the block
5. Turn key to "on" and report back what the gauges do.

jin whelan said

Installed new gauges and circuit boards, pull harness and cleaned, repaired and inspected. Reinstalled with new tested ok gauges

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1. Where did you get the "new" gauges from?
2. Did you compare the old cir board to the new cir board?
3. Did all the traces line up the same?
4. You state " Reinstalled with new tested ok gauges" how did you test the gauges?