Fixed (I think)
I realized I had three Westerbeke temperature gauges on the boat. The suspect one on the genset, and one in each of the gauge clusters for the main engine, on the lower and upper station.
I swapped the one out from the upper station, but before starting the genset decided to check the antifreeze level. The overflow bottle was full and the fluid pristine but one of my friends recounted how his genset overheated even though this overflow bottle was full. It turns out the hole that feeds it below the radiator cap was blocked.
We found exactly the same condition. Full bottle, real low on actual coolant, and had to take off the L fitting to clean out the crystallized antifreeze.
Topped of the antifreeze, started things up and the temperature readings on the gauge have stabilized. We also could see the antifreeze burping back into the overflow bottle as air worked it's way out of the system. It is obvious that the antifreeze needs changing as it is pretty disgusting looking.
Problem solved.
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