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It's a GM part. Try Walts RV Supply in Fontana, CA. He used to have several instrument clusters from that vintage P-30 in Fleetwood.
Did you check the sending unit? It's more prone to failure then the gauge. It's located in the engine block between #2 & 4 cylinders (near the spark plugs) I think an open sending unit or broken wire will give you a "hot" reading.
You can troubleshoot the sending unit by removing the wire with the ignition "on" and watch the guage. You can also install a test light between the wire and ground. The bulb acts as a resistor and drives your needle.