Oil pressure sender unit confusion

67Dart273 said

The simple answer is the type you pictured with 3 terminals is a SWITCH and not a gauge sender. I'm not familiar with the options/ wiring of these girls, cannot offer an explanation. Maybe originally there was a tee and used both?

Without a factory wiring diagram, no idea

EDIT

Found this, no answer........they show a single sender wire

Offroad Exchange - 79 Dodge Factory Service Manual

Page 2, far left, shows wire O-18WH (WHite)

http://www.offroadexchange.com/pdf/79dodge_wiring_diagram.pdf

Click to expand...

Thank you!

The workshop obviously installed an oil pressure switch which is wrong when connected to the oil pressure gauge, see picture below.

When this didn´t work, they cut off the three terminal connector in order to solve the problem, using two of the wires to the switch, the result is a gauge pegging att 100 psi with the ignition on, pulling some quite current in the same time.

So far I know:

1. The pressure switch is all wrong for my gauge
2. The gauge is moving, probably working
3. With the gauge pegging, it´s connected through the harness to the switch

There is one white wire of the three that went to the connector.

Is there a way to measure with a volt/ohmmeter which wire that should connect to the correct oil pressure sensor?

Feels a bit scary to connect wires randomly...