my indash gas gauge was not working when I bought this truck so I added a new aftermarket gauge and checked the sending unit. The sending unit works fine,  but when the tank is full the gauge reads empty and when the tank is empty the gauge reads full.  what am I doing wrong

Thanks

tom in iowa

54 Merc wagon

54 sunvalley

Switch the wires? Chuck in NH

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Is this truck pos or neg ground?

  

Polarity won't change it, the gauge works by heating and cooling of the bimetal strip in the gauge.  The gauge and sender are simply not matched to each other.

John - "The Hoosier Hurricane"

It is a negitive ground truck

tom in iowa

54 Merc wagon

54 sunvalley

You bought a gage for a GM product. They're backwards from Ford.

Frank/Rebop

Bristol, In ( by Elkhart) 

Sounds like a bad or wrong combination.Check back with the  supplier.

  

I had a similar problem with my '56 Customline. I bought all new guages from Haneline,but in the end, I had to get one of their sending units too for the fuel guage.

Rono

  Ron Lane,  Meridian, ID