Oil pressure sender unit confusion
This is the one listed for use with a gauge.
Look for another terminal in the harness with a single, female spade-like connector. Use that one.
If there is no connector, then two things come to mind:
Was the harness replaced? A harness with "warning light only" wiring may have been used.
If not, was the instrument cluster replaced, using one with the pressure gauge instead of a light? They came both ways...
Trace the "hot" wire (ign. on) from the gauge to the sender plug, that is the one you need to connect to the gauge sender.
Remember, the gauge sender is nothing but a pressure-variable ground for the gauge. Find the wiring diagram for your year truck, it will simplify the process.
This is the one listed for use with a gauge.
Look for another terminal in the harness with a single, female spade-like connector. Use that one.
If there is no connector, then two things come to mind:
Was the harness replaced? A harness with "warning light only" wiring may have been used.
If not, was the instrument cluster replaced, using one with the pressure gauge instead of a light? They came both ways...
Trace the "hot" wire (ign. on) from the gauge to the sender plug, that is the one you need to connect to the gauge sender.
Remember, the gauge sender is nothing but a pressure-variable ground for the gauge. Find the wiring diagram for your year truck, it will simplify the process.