Odd temperature activities

RustyRatRod said
Maybe you reckon you can give some details? Like what engine and mods if any you know.....all the stuff we need to know?

Sorry - thought I mentioned that in the initial comment. 225, completely stock other than an electric ignition. No mechanical changes at all in the 500 miles leading up to the first occurrence of the described symptoms.

1WildRT said
Have you verified with the IR thermometer that it's hotter when the gauge says it's hotter? Or just when the temp is normal?

Tracked it with IR all the way up to the hottest I had seen, 205 on the IR.