There is no power to the sending unit as it is a switch (activated by the pressurized oil pump) that signals a relay, this relay in return sendy 12 volts to another relay, which turns on power to the gauge indicating there is pressure
On my 1995 Ford Explorer, with the 4.0 L OHV engine, the sending unit for the oil pressure guage is located just below the power steering pump.
On the drivers side of the engine , below the power steering pump
On a 1996 Ford Explorer : ( if you have the 4.0 liter EFI , V6 engine ) The oil pressure sending unit for the gauge is on the drivers side of the engine , below the power steering pump )
drivers side of engine , below the power steering pump
The sending unit for the fuel gauge is inside the fuel tank with the electric fuel pump ( I believe fuse # 17 - 15 amp - is for the fuel gauge on a 1991 Ford Explorer )
This is only going to answer 1/2 of your question but the oil pressure sending unit is on the drivers side of the engine , below the power steering pump
The fuel sending unit for your fuel gauge is inside the fuel tank with the electric fuel pump
On the 4.0 L OHV, it is on the driver's side of the engine below the power steering pump.
I believe that is near the oil filter
The fuel sending unit for your fuel gauge is in the fuel tank with the electric fuel pump
I believe the oil pressure sending unit for the oil pressure gauge is located on the drivers side of the engine , below the power steering pump ( 4.0 L - OHV - 6 cylinder )
On the 4.0 L - OHV - V6 engine : On the drivers side of the engine , below the power steering pump