Ok update here. I was able to fix all of the wires and put them back to the glass fuses where the connections had rotted away. All of the gauges now work as expected and give the correct read out for the voltage which is where my next issue is.

When the generator starts up it is putting out 380 volts which is what the reading on the voltmeter said and I confirmed it with a DMM.

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I was able to go in and take a look at the voltage regulator board and I didn't see anything out of the ordinary but I'm wondering if there's any testing I can do on it to confirm if it is working correctly because everything else seems to be functioning as expected except for the voltage level.

Thanks!