I swapped a gauge set with economy gauge from an '86 420 and now the fuel gauge doesn't register. I hasn't run long enough to check the temp gauge. The oil pressure gauge works. I can't find my 126 FSM CDs and I can't find anything online. Does someone know the pin out differences between an '83 SD and '86 420 in that big honking 15-pin connector? Dang, there was a time I didn't need a 126 wiring diagram

Sixto
83 300SD