Remove the gauge sensor bulb from the engine, and take the gauge out of the dash. Immerse the sensing bulb in a pot of boiling water and adjust the needle position to 212 by whatever means necessary- - - -bend linkage, change gear position, etc. The boiling point is the important indicator. Let the "cold" setting fall wherever it chooses- - - -you want to get an accurate "overheat" reading to protect the engine.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!