ls swap. oil pressure gauge not working - Team Camaro Tech
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post #1 of 9 (permalink) Old Aug 19th, 18, 02:24 PM Thread Starter
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ls swap. oil pressure gauge not working

OK guys, I have an oil pressure gauge that is not working. I replaced the sending unit thinking that was the problem, no dice. I'm using New Vintage USA gauges. All of the other gages work fine. I grounded the lead and the oil gauge pinned as it should. Any thoughts ?? Does the sending unit have to be grounded ??? I'm using an adapter which allows me to use both the sending unit and the computer connection.

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post #2 of 9 (permalink) Old Aug 19th, 18, 04:42 PM
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Re: ls swap. oil pressure gauge not working

Most sensors do need to be grounded and teflon tape (if thats what you are using) sometimes causes ground issues. To prove a ground issue or rule it out simply strip both ends of a piece of wire and manually ground the sensor body.
I've experienced this same scenario before and what has worked for me is ensuring the teflon tape or other sealant is only on the first few threads and the last threads are bare ensuring metal to metal contact and good ground.
Also be careful with the teflon tape....you want to be sure there is nothing that can come loose and get into an oil passage so I try to start the sealant a few threads up as well.
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post #3 of 9 (permalink) Old Aug 19th, 18, 05:00 PM Thread Starter
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Thank you. I will try to ground it.

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post #4 of 9 (permalink) Old Aug 19th, 18, 06:32 PM
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Re: ls swap. oil pressure gauge not working

I do not believe grounding the sender is the problem.

What adapter are you using? I would remove it and install the gauge sender directly into the block to confirm that the gauge/sender is working or not.

#1. Probably a wiring mistake. Recheck gauge wiring. Check voltage at gauge for 12v and gauge grounding

#2. Bad gauge.
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post #5 of 9 (permalink) Old Aug 20th, 18, 02:55 PM Thread Starter
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Re: ls swap. oil pressure gauge not working

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Originally Posted by Vega$69 View Post
I do not believe grounding the sender is the problem.

What adapter are you using? I would remove it and install the gauge sender directly into the block to confirm that the gauge/sender is working or not.

#1. Probably a wiring mistake. Recheck gauge wiring. Check voltage at gauge for 12v and gauge grounding

#2. Bad gauge.
Thanks John, I grounded the body of the sender and the gauge worked perfectly. The sender must not be making good contact for some reason. (Thread sealer used and/or adapter fitting from Aeromotive) The adapter fitting allows me to use the ECM oil connection and gauge reading from same port on back of engine.

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post #6 of 9 (permalink) Old Aug 20th, 18, 03:30 PM
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Re: ls swap. oil pressure gauge not working

Cool. So maybe the adapter is interfering with a good ground?

Teflon use does not affect ground as the thread cut right though it. Unless maybe too many wraps?

Good wiring gauge and sender are working

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post #7 of 9 (permalink) Old Aug 20th, 18, 03:45 PM
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Re: ls swap. oil pressure gauge not working

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Thanks John, I grounded the body of the sender and the gauge worked perfectly. The sender must not be making good contact for some reason. (Thread sealer used and/or adapter fitting from Aeromotive) The adapter fitting allows me to use the ECM oil connection and gauge reading from same port on back of engine.
ECM does not need that oil pressure sender...

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post #8 of 9 (permalink) Old Aug 20th, 18, 04:52 PM Thread Starter
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Yes Don, I remember you said that about the oil connection not being needed. I saw this adapter and went for it lol , thx everyone. Also I didn’t use tape. I used thread sealer. I’ll use a SS wire tie and a piece of wire to ground the body of the sending unit.

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post #9 of 9 (permalink) Old Aug 21st, 18, 05:59 AM
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Re: ls swap. oil pressure gauge not working

John...most of time the threads will cut right through and not present an issue especially where the threads are rough/sharp but I've seen cases where the threads are nice and smooth and they just do not cut through the tape or sealant enough for a good ground. I always put a meter on the sender body and ground to see if I have a good ground.
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