I have a 70 Barracuda. My gas guage reads a quarter to a half a tank after I fill up. I tried replacing the sending unit (an OER unit). The samething happened. I have a ground to the sending unit, directly from the battery. I tried both sending units outside of the tank, both seem to work fine. When I place the units back in the tank, they read the same as before. I checked the sending units with an Ohm meter, it's within specs. I know the guage works, I grounded the lead, it pegs the guage. Could there be something in the tank that is interferring with the sending unit? This is driving me crazy. Thanks.