Thread: Oil Pressure Gauge Help???

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Originally Posted by Trjohn57

What can we say about old timers....................................?
Is your adapter where the sensor goes plugged?
Did the dummy light work?

No adapter on a 390.....Oil Sensor is screwed to top of oil filter housing.
Plugged as in the oil access hole is blocked I doubt it because yes the idiot light did work (meaning it wasn't on) prior to this project.

I understand that the sensors are very prone to be bad, even new, but I have gone through 3 already.
I know the gauge works because if I ground it the needle pegs. I'm also guessing because of this I also have the correct low voltage needed from the volatge regulator.

Am I missing something?

Originally Posted by kbmwgt

No adapter on a 390.....Oil Sensor is screwed to top of oil filter housing.
Plugged as in the oil access hole is blocked I doubt it because yes the idiot light did work (meaning it wasn't on) prior to this project.

I understand that the sensors are very prone to be bad, even new, but I have gone through 3 already.
I know the gauge works because if I ground it the needle pegs. I'm also guessing because of this I also have the correct low voltage needed from the volatge regulator.

Am I missing something?

I believe you are missing the question, from what I have highlighted, you are saying you are using the sensor for the idiot light . Read the name of the manufacture from the gauge, order the sensor. If you cannot find the name upload a picture of the gauge . Real sure someone here will be able to id it.

Not sure but if I were a betting man i would guess there are 3 to 4 sensor manufactures and there is a good chance less the that. Electrical oil pressure sending units have been around for quite awhile and are reliable overall.

You know the gauge works, question are you grounding it using the wire that is attached or will be attached to the sender? If not use that wire it will prove the integrity of the circuit . Just one more thing, most gauges work on the full 12 vdc if we are talking SW or Autolite style .

Thanks.

The gauge is a 1967 Ford Mustang. The sensor was changed from a button type (sensing 5psi or lower) for the idiot light to the cannister type which Ford had used for years (uses a resistor).

The gauge is a two post type. One for the stepped down power of 5 v and the other going to the sensor. I'm told less resistance in the sesnor more power to the gauge...needle moves.

It seems that power is going through all the right places which points to the sensor/sending unit. I was hoping I guess that some-one would slap me and say you forgot.........something......but. I guess more tesing is needed to track down the problem.

Originally Posted by kbmwgt

Thanks.

The gauge is a 1967 Ford Mustang. The sensor was changed from a button type (sensing 5psi or lower) for the idiot light to the cannister type which Ford had used for years (uses a resistor).

The gauge is a two post type. One for the stepped down power of 5 v and the other going to the sensor. I'm told less resistance in the sesnor more power to the gauge...needle moves.

It seems that power is going through all the right places which points to the sensor/sending unit. I was hoping I guess that some-one would slap me and say you forgot.........something......but. I guess more tesing is needed to track down the problem.

I would think you could check your sending unit pretty easy, but it might take a second pair of hands or some aligator clips on meter leads. Put an ohm meter on your sending unit from the output terminal to the case and you'll see resistance. Then set your air supply regulator to say 40psig, put a nozzle on the hose and blow that pressure into the end of the sending unit. Should see a change in resistance, right? Seems logical to me, but could be too simple?

Going to try that this weekend.