Thanks all!
Thanks all for your responses!
Yes, it's a new auto meter gauge.
It may have been running lean- last time I had it running, the exhaust was burning my eyes- gotta read the plugs.
The car has other issues which we are working on that I won't go into here right now.
I think the most credible theory is that there have been air bubbles in cooling system. I am going to drill a 1/8" hole in the thermostat to allow for a little better water flow and to "burp" air bubbles, especially just beneath the thermostat (the thinking being that hot water was touching the gauge sensor, but not the thermostat whereby it was not opening.
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