so i've installed all new gauges and all of them work except the fuel gauge. what's happening is it won't read past half it it reads backwards... i've got a good knowledge of 12vdc systems and i've installed a brand new painless harness so all the wires are marked. i've got the gauge properly grouded to a chassis ground, the fuel tank is full and before i call autometer i figured maybe i can look for some help here.