Stewart Warner Gauge reading off by 20 degrees??

What makes you thing the IR gun is more accurate? "Jus' sayin' "

Best way to check the SW is to stick the sender in some boiling water. (Is this electric/ mechanical?)

(For that matter, you can check your stocker. Just temporarily extend the sender wire and a ground wire)


"Rig" a hotplate/ coffee pot, etc, so that you can stick the sender in there and boil away. Check your local altitude. For all I know you live in Denver.

This page corrects the boiling point of water with altitude and / or barometric pressure

http://www.csgnetwork.com/h2oboilcalc.html