I did a calibration before, but used oil as the bath. We went to 180F to
get the correct position on the gage face. Although I believe it
correct, I plan to do it again. It is not hard to do.

Ross
Orval Fairbairn wrote:
snip

It sounds as if either:

a) Your baffles are extremely efficient.

b) Your sender/gage are out of calibration.

You can check (b) by removing the sender at the next oil change and put
in a cup of water heated to several temperatures and measured with a
candy thermometer. Check the gage against the thermometer.