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OK, so I think I found the source of the problem. I wiggled and twisted and made sure the wire connector that plugs into the water manifold sending unit was fully seated and I gave had no more gauge issues. The connector felt fully seated but something in that connection needed some attention.

I briefly ran the truck yesterday just parked in the yard and the gauge was steady as could be. Alternator output was also steady at 28.52 volts. Could be the previous behavior was a fluke or I'm starting to see intermittent erratic gauge behavior which would point to a failing gauge, right?

The gauge could be crapping out but it's suspicious that it only bounces when the alternator is spinning.

Anything is possible. It's an old alternator with a new voltage regulator that was burnt up inside...

The title describes what I'm seeing which is a new behavior ever since I replaced the voltage regulator. The needle bounces back and forth from far left up to actual engine temp with the engine/alternator running. When I shut off the engine but keep the master switch on the temp gauge is...