Great,
make sure you check the old forum posts about iffy or jumpy temp gauges , like:

https://www.peachparts.com/shopforum/diesel-discussion/383571-erratic-temp-gauge.html

You may want to use google advanced search for better results.

P.S. IR thermometers can be tricky, even those with adjustable emissvity (and yours isn't. It is pre-adjusted @ 0.95 emissvity factor). Always use the same surface when comparing differences (electrical or masking tape being the most convenient).And even then one can get wrong readings.

It turns out TCouples can be wrong too (I did not know that...some alloys can rust). It may be necessary to sacrifice/lose one or two during a test,lol...aspecially wthen the ways to attach them to the surface is limited (JB weld ,Gorilla tape etc.).


Happy Fourth of July !