I replaced my heater core thinking that it would give me heat...I was wrong.I heard that the main control unit could be the problem.I went and picked it up from a wrecking yard and sure enough I got heat,but then my fuel guage and temp guage would'nt work. I got part number P4677215 and the one that I need is p4677615ae...I guess it does make a differance.Does anyone have this heater control if so maybe a trade or sell?