Is it possible to run two fuel gauges off one sender and have them be accurate? Or will that split the ohm load? (stock in dash then aux auto meter gauge)

 

It should work, if you install a switch (single pole, double throw) to allow you to use one sender at a time.
Your readings will not be accurate if you directly connect both gauges to one sender.

Roger Carter

 

the real question is why?

 

Haha for awhile the in dash gauge didn't always want to work right so figured I would get a new gauge (under dash) to use. But for whatever reason the idea of having to look at the gauge doing nothing in the dash is going to annoy me if I just use a aftermarket under dash gauge. So figured I would just hook both up if possible then it wouldn't annoy me.lol But never mind!

 

If you really wanted to make this work, you'd need to use an electronic circuit consisting of a high-impedance buffer. Otherwise, the equivalent impedance of the two gauges in parallel would affect the voltage division between the gauges and the sending unit, altering the reading of both gauges. Not worth the trouble.