Is there some reason not to use an old school potentiometer, and dial in whatever resistance is needed to handle the load of the gauge? Simply connect the ends of the resistor to power and ground, and dial up the movable contact to get whatever voltage makes the gauge work most accurately. Lots of potentiometers have a lock nut to anchor the shaft down once the proper voltage is achieved on the wiper contact.
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!