Quick oil pressure gauge wiring question Options

[Tdskip]

Good morning - hope everyone is going well.

I have an oil pressure gauge that looks like this one (not my car in picture but same sender),

1) I believe one terminal is for the actual pressure reading and one if for the warning light?

2) If that ^^^^ is correct does it matter which terminal is which? in other words is one terminal specific for the actual pressure reading?

Thanks!

[framos914]

Yes, the oil pressure warning light.
On the sender the G pole connection goes to the gauge and that works fine registering the pressure in PSI.
When i disconnect the wire at the WK pole of sender and ground it to engine the light turns on proving wiring to the warning light is good.
I believe the sender is bad, but the ones I see are 150 psi, don't think it will work with my 0-70 PSI gauge.
It's a 1974 2.0 engine.

[rgalla9146]

Yes, the oil pressure warning light.
On the sender the G pole connection goes to the gauge and that works fine registering the pressure in PSI.
When i disconnect the wire at the WK pole of sender and ground it to engine the light turns on proving wiring to the warning light is good.
I believe the sender is bad, but the ones I see are 150 psi, don't think it will work with my 0-70 PSI gauge.
It's a 1974 2.0 engine.

Any chance you used teflon tape on the sender ?
Doesn't seem posible the gauge works but the light doesn't ground.
Test the sender directly with a test light.
Attach one leg of light to battery, other to post on sender.
Lamp should be on untill engine starts. Oil pressure removes the ground.

[framos914]

Any chance you used teflon tape on the sender ?
Doesn't seem posible the gauge works but the light doesn't ground.
Test the sender directly with a test light.
Attach one leg of light to battery, other to post on sender.
Lamp should be on untill engine starts. Oil pressure removes the ground.
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Was thinking about Teflon tape as a possibility since the engine was rebuilt recently at a shop.
Checked w/ test light, light on for variable side no light fot switched side. I just read that resistance from WK pole to ground should be less than 10 ohm but I get 15-16.
Tight fit location next to distributor, hope I can get it out without moving distributor to check for teflon tape. If no tape, will have to replace it.