A straight resistor won't calibrate the gauge- - - -you'll need to build a Wheatstone bridge that uses a variable resistor to fine tune the reading. That project is "Electronics 101" that the USAF taught me back in 1968.
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!