It could be the senser, not sure what style he has, my 77 had a short cable from the transmission to a box that had a sending unit on it for the cruise control and the speedo wires, he might have the disc style pick-up off the driveshaft, they act up over time and can be rebuilt, I still have this sending unit from the 77 if its needed, the transmission was an mt640 I believe
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Keith, Krista and Family
77 38' Newell Coach Repowered from Smokin' V555TA To 325hp 8.3 inline 6 cummins, Allison 3000 series trans
87 40' Newell Coach 475hp 8V92 DD(sold)
22' 350hp Jet Riverboat
79 Ford F250 4x4
Many others to list
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