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1985boat shevrolet 350 oil presher guage peged.replased sending unit

Twin skrew 350 port side fine starbord side oil presure guage pegs to 80 psi uper helm to lower helm changed sending unit shecked contanewity witer 12 volts ground sender wires .same voltage as other side that works .bought new guage bout new sender .if i unplug the sender gauge goes behind zero ,polarity ?

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Stuart Kirby

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YES. POLARITY MATTERS TO THE GUAGE

Posted on May 04, 2015

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Oil presher guage .polarity .wires hooked right new guage new sender .sender wire off guage goes behind o its suposto peg doesnt


you need a new sending unit and stop unplugging things when there is power to them,you can ruin it

May 04, 2015 | Cars & Trucks

1 Answer

Oil pressure gauge pegs at 80 PSI as soon as you turn the key on. I have replaced the gauge and confirmed the sending unit is working properly. Any ideas on where to look next?


Sounds like a grounded wire. Most senders change resistance to the ground circuit of the gauge. If it pegs there is no resistance to ground and probably a shorted wire.

Dec 31, 2013 | 2003 Chevrolet Silverado 1500

1 Answer

2003 yukon denali oil pressure switch pegged over the 80 psi indicator. Oil qty is good.


Sounds like a bad oil pressure sending unit.

Try unplugging it and see if the gauge drops to zero. If it does than replacing the oil pressure sending unit will most likely fix your problem.

It is not easy to see or get at but you can find it on the back side of the engine on the drivers side, kind of in between the valve cover and the intake plenum

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Apr 08, 2013 | 2003 GMC Yukon Denali

1 Answer

NO OIL PRESSURE READING ON DASH


remove sending unit and install mechanical gauge to see oil pressure psi if psi reads ok- change sending unit again if psi to low less then 6 replace oil pump och.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/mike_9693b5ad75773352

Sep 18, 2012 | 1990 Toyota 4Runner

1 Answer

The oil presure gage goes up and down from zero to


All you have to do is replace your oil pressure sending unit.It`s in the rear of the motor by the left head.This is the drivers side.You need a special socket to remove the sending unit.Good luck.

Dec 05, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

1998 toyota camry,4,cylinder, 5 speed


it sounds like your oil pressure sending unit may be plugged by whatever took your pressure down to 5-8 psi the first time. this is extremely low pressure as i am sure you know but at 30 psi your light should go off i would replace the sending unit if your oil pressure is holding 30

May 15, 2009 | 1998 Toyota Camry

1 Answer

Oil pressure gage pegs 80 psi


Likely your oil pressure sending unit has failed or the wire has grounded.

Mar 28, 2009 | 2000 Jeep Grand Cherokee

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