ok guys I need some technical help. I am trying to figure out why my stock fuel gauge for my 56 f100 (12 volt system)is not working (the needle wont even move). I replaced the fuel tank sending unit and float and replaced the gauge with another stock one that worked perfectly fine on another 56 f100. I then tried running a neg and pos wire from the battery straight to the fuel gauge and the needle moved all the way up to full (So now i know it is not the gauge). What could the problem be..im lost now. what should i do. Any help would be great.