i have a 97 ford f150 xl 4.2L 4x4 reg cab short box. i am having a problem with the fuel guage. when i start the truck it goes to the full mark. i have already replaced fuel pump and sending unit. i have also installed a new instrument cluster. when i test the wire (yel/wht) at the back of the cluster it has constant power. i am told this is the wire coming from the sending unit. so after all of this i am to assume there is a break in the wire somewhere. i just do not know how to find this break. if you know how to find this break then please help me. thanks, mike.