Tim Denning
Junior Member
My 1986 D150 has an oil pressure gauge that has been bypassed and replaced by an oil fed mechanical unit. I would like to remove the aftermarket item and return to the original gauge in the dash. I've bench checked the gauge and it is working so I'm assuming that either the wiring or the sending unit failed.
I know where the sending unit is supposed to be, however, there appears to be an oil pressure switch in addition to the aftermarket oil feed line that was installed (again, I assume in place of the original sending unit). I'm thinking the original oil pressure sending unit went there, however, I can't find the connection wire to it (I believe it's supposed to be white).
Question: Was it normal to have both a switch and a sending unit together in the the truck or am I missing something? The wiring under the hood has been pretty heavily hacked and I'm slowly trying to return it to it's original functionality.
I know where the sending unit is supposed to be, however, there appears to be an oil pressure switch in addition to the aftermarket oil feed line that was installed (again, I assume in place of the original sending unit). I'm thinking the original oil pressure sending unit went there, however, I can't find the connection wire to it (I believe it's supposed to be white).
Question: Was it normal to have both a switch and a sending unit together in the the truck or am I missing something? The wiring under the hood has been pretty heavily hacked and I'm slowly trying to return it to it's original functionality.