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With S1 in the RUN position check M6 Terminal "I" (eye) to be sure ~24 VDC is present. Also check that M7's mounting bracket is connected to chassis ground. If that all checks out then I suspect you have a bad sender. With S1 in the RUN position measure the voltage at the Temp Senders terminal...

It doesn't matter which wire you hook to the red or black wire. The Temp gauge not working will have no effect on the generator operation.

Sorry bout that, was thinking OP gauge. The Coolant Temp Sensor is MT6 in the schematics. The wire connected to it is 129Axx It goes to Connector P7 pin 2. In turn it's connected to J7 pin 2. J7 pin 2 is connected to wire 129Bxx which then runs to the Temp gauge (M6) "S" terminal.

Those two wires are suppose to be connected to the cut off RED and BLACK wires hanging down from the Oil Pressure Switch in your last two pictures. No they are not related to the Oil Pressure gauge not working. Might want to check the wire from the Oil Pressure Sensor, the goldish thing with...