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  #1  
Old 05-30-2012, 08:05 PM
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Unhappy Lazy OIL psi gauge

My Rubicon has developed a Lazy oil gauge. The gauge is not rising and falling with engine RPM. It stays just past the middle of the gauge. I suspected the seding unit/switch, replaced it with a factory part, no change. It has a single purple wire to the connector. I grounded it expecting the gauge to MAX out, it did NOT. I have not put a machanical gauge on it yet. I would appriciate any assistance.
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Old 06-07-2012, 09:43 PM
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Re: Lazy OIL psi gauge

I'm not sure about '06 but the '04 does not have a gage. The gage is just for looks and stays in the middle unless your pressure drops to about 4-7 psi and the gage will read ZERO.
In other words the gage is fake!
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Old 06-08-2012, 07:23 AM
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Re: Lazy OIL psi gauge

If the sending unit connector has only 1 wire, it is in fact a low oil pressure switch. So indeed the indication should go to a fixed position when oil pressure is high enough, or just 0. If you ground the wire then its just the same as having 0 pressure, so its normal that the pointer stays at 0.
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Old 06-09-2012, 08:33 PM
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Re: Lazy OIL psi gauge

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Originally Posted by Frango100 View Post
If the sending unit connector has only 1 wire, it is in fact a low oil pressure switch. So indeed the indication should go to a fixed position when oil pressure is high enough, or just 0. If you ground the wire then its just the same as having 0 pressure, so its normal that the pointer stays at 0.

Or REMOVE the wire from the sending unit and the gage will read normal or a little more than half way!
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Old 06-09-2012, 08:59 PM
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Re: Lazy OIL psi gauge

I think i made a mistake here, the contact in the pressure switch will close with pressure and make the ground for the purple wire and the indicator should go somewhere halfway. When removing the wire should be the same as an open switch and 0 PSI.
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Old 06-09-2012, 11:15 PM
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Re: Lazy OIL psi gauge

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Originally Posted by Frango100 View Post
I think i made a mistake here, the contact in the pressure switch will close with pressure and make the ground for the purple wire and the indicator should go somewhere halfway. When removing the wire should be the same as an open switch and 0 PSI.
Just the opposite,switch is NC at less than 7 psi. Grounding the purple wire will send gage to zero.
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