i just bought a 89 2.9 4wd was real dirty so decided to pressure wash it off so i did under the hood and some on the frame before i did this my fuel gauge worked great as soon as i started the truck it read empty i have replaced the gauge and the sender must be wiring problem where do i start looking where is the harness under the hood maybe i got somthing wet or a ground is broke and is there a wiring diagram for the sender and gauge thanks