Not real happy with autometer

autometer responded and told me to check the grounds...I know they are good and plenty...check the feed wires for each gauge...ALSO good & plenty. check the resistance at different fuel levels ( right ...I will just suck all the gas out and drop that puppy in my yard take it all apart and move the sender Up & down ) to prove it is not the gauge.... HOW would I know what the fuel level IS if the gauge isn't working properly ??? A$$ clown..

.STILL NOT HAPPY