Oil Pressure gauge question

[lyonsfin]

I have read several previous posts. Gauge was not reading above 3 bars, disconnecting and grounding the sender wire produced 5 bars and 0 bars respectively. Replaced sender and then gauge pegged to 5. Purchased a good used gauge and still pegs all the way up and does so when wire is removed and grounded.
First question, did I screw up the wire connections at the gauge? Anyone know the actual connections?
Second, is there a way to test the gauge or sender?
Thanks

Josh

[JJ 911SC]

Originally Posted by lyonsfin

I have read several previous posts. Gauge was not reading above 3 bars, disconnecting and grounding the sender wire produced 5 bars and 0 bars respectively.

That proved that your wiring and gauge was working properly.

Replaced sender and then gauge pegged to 5.

Either the sender has an "open" or you introduce a wiring problem but doubtful as there is only one wire to play with.

Josh

Josh

I think your "new" sender has a problem but since you did not expect that you replace the gauge and introduce another problem and you are now chasing your tail

I would put your original gauge in, get it working properly (peg when the sender wire is unplug and at 0 when grounded).

Them put back you original sender to see if you are back with the original problem (stop reading at 3 bar).

If you are, then try the "new" sender and if it peg all the time at any RPM, you got a bad one.

Where did the "new" sender come from?

[lyonsfin]

I had a reputable independent shop replace the sender. He said he tested the gauge and said it was bad. That is when I got a used gauge that had been working previous to being removed. I cannot find any info on testing the gauge itself, though. It is possible that the used gauge is bad, but it seems too much blike coincidence to me.

[calling911]

Originally Posted by lyonsfin

I had a reputable independent shop replace the sender. He said he tested the gauge and said it was bad. That is when I got a used gauge that had been working previous to being removed. I cannot find any info on testing the gauge itself, though. It is possible that the used gauge is bad, but it seems too much blike coincidence to me.

I guess you know its no longer "reputable". Your sender is bad based on your description.. If you left something out then add it.. I dont even think its possible you have the "wrong" sender for the gauge.. dont think any sender would peg a gauge.. but I could be wrong..


Tail chasing is a great analogy

Put it back to where it was and start over.

Now that you mention it.. Im fighting heat... I need to do some boiling water tests with mine... make sure Im fighting heat and not the damn gauge.

[Neel]

Sounds like a bad (or wrong) sending unit, from what you have described.. If you have an Ohmmeter, you can check the sending unit easily: Engine off, connect the meter to the connector on the sender, with the sender wire disconnected and the other end to ground.. Note the reading on the meter.. It should have a high ohmmeter reading ~ infinity ohms.. If you have a low reading, you have a bad/ wrong sender.. Also check to make sure your new sender has a bit of a 'bell' shape to it.. If it doesn't, they put the wrong sending unit in.. I can't imagine that happening, but the shop apparantly midiagnosed the original problem, so I guess anything can happen.. I hope this helps..

[JJ 911SC]

Josh

I check you stats and you got an 83SC, good idea to put this info in your signature block.

If you got them, post the number of the original Gauge & Sender as well as the used Gauge that you put in & the Sender that the shop put in.

PM on your way.