Fuel Guage ??

OK, tried putting in a new fuel gauge, having wiring checked, and still the gauge doesn't read properly. WTF This has been checked out by a reputable person, NOT me, and we're still not coming up with any answers. Just picked the car up today after having the 6pak intake installed. Knowing my gauge is goofy, and was at the time sitting on E, I stopped to top the tank off to be sure I made it the 30 minute drive home ! A whole 4.8 gals to fill her up and register full ! We tried 2 BRAND NEW GAUGES and still not registering right, any ideas ? :banghead: Ohms were checked before installation, one extra gauge that I had laying around from my /6 project actually read opposite on the ohms, but we are just lost on where to go from here ! Open to any and all ideas or suggestions !!