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post #1 of 20 (permalink) Old 07-05-2010, 03:17 PM Thread Starter
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Oil Pressure Gauge Problem

H'okay. So I installed an Autometer Electronic Oil Pressure gauge. The problem is, as soon as you turn the car on, it pegs at 100psi and stays there. I have all the wiring run correctly, unless there is a problem with my ground. I ran my ground under the dashboard like I have for all my other electronic addons. Do I need to run the ground out to the engine block for it to work correctly? The sender says it grounds through the block via the adapter (and my adapter is made out of a steel drain plug, eff those flimsy brass ones)


I read this, but didn't get a good solid answer out of it. https://www.yourcobalt.com/forums/che...e-problem.html

So, just looking for suggestions.


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post #2 of 20 (permalink) Old 07-05-2010, 03:28 PM
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I had the same problem on mine when I first installed it -- read 100 PSI at idle. Try running a temporary ground directly to the block from the gauge -- I ended up doing that to get it to read correctly. At least you'll know if that's your problem too.

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post #3 of 20 (permalink) Old 07-05-2010, 03:34 PM Thread Starter
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I took a length of wire and hooked it to the back of the gauge and had my dad hold the other end on the block, and no change. i mean, I could try running a proper ground as well....


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post #4 of 20 (permalink) Old 07-05-2010, 03:37 PM
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post #5 of 20 (permalink) Old 07-05-2010, 05:26 PM
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If I remember right I also had same problem and ran the ground to the block and it stopped being pegged. What is your power source for the back lighting?



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post #6 of 20 (permalink) Old 07-05-2010, 05:33 PM
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hmmmmmm, my autometer is grounded under the dash
but it doesn't peg 100.

Did you use teflon tape on the sending unit or adapter ?
I have seen it stop the ground for the sending unit......
just a thought here.

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post #7 of 20 (permalink) Old 07-05-2010, 05:41 PM
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Quote:
Originally Posted by Foximus View Post
I took a length of wire and hooked it to the back of the gauge and had my dad hold the other end on the block, and no change. i mean, I could try running a proper ground as well....
The oil pressure valve holds pressure up to 75 psi - when cold it can go up to 80 psi. At idle you can have as low as 17 psi and factory specs call for 50 psi @1000RPM minimum.

If you are running a partial sweep gauge you should have the large oil sending unit...full sweep gauge uses the small oil sending unit...any chance there's a mix-up?

---------- Post added at 07:41 PM ---------- Previous post was at 07:38 PM ----------

Quote:
Originally Posted by Cherry GT View Post
hmmmmmm, my autometer is grounded under the dash
but it doesn't peg 100.

Did you use teflon tape on the sending unit or adapter ?
I have seen it stop the ground for the sending unit......
just a thought here.
...another possibility...try running a short piece of wire and ground the sending unit to the block and see if there is any change.

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post #8 of 20 (permalink) Old 07-05-2010, 06:48 PM Thread Starter
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My 12v source is off my accessory line, my gps, radar, etc etc.

I have teflon on the adapter and the block fitting. I can try taking that all off.

I bought the whole thing off a guy on here. Its an old school or hot rod gauge and the sender is like the size of a D battery I think.


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post #9 of 20 (permalink) Old 07-06-2010, 09:49 AM
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fox....where did u get the fitting that comes off the block?
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post #10 of 20 (permalink) Old 07-06-2010, 02:10 PM
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Quote:
Originally Posted by robplen View Post
fox....where did u get the fitting that comes off the block?
You can order them from TTR / Summit / Jegs.

But his dad just made one for him.




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