Oil Preasure Sensor
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
It is on the back top center of the engine.
But if the oil gauge is pegged out it is not the sensor (sender).
The oil pressure sender is a off and on switch.
Sounds like you have a cluster problem or someone has shorted out the resister on the back of the cluster.
But if the oil gauge is pegged out it is not the sensor (sender).
The oil pressure sender is a off and on switch.
Sounds like you have a cluster problem or someone has shorted out the resister on the back of the cluster.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
When the oil pressure goes higher then 5-7 PSI the oil pressure sender closes grounding the the sender wire. An open wire (less than 5-7 PSI) there is no current passing through the wire and the gauge reads zero. With the pressure higher than 4-7 PSI you have maximum current through the wire that the gauge and the inline resister (20 ohm) lets through.
In other words if you ground the wire from the gauge the needle should be at half scale.
If the resister was bypassed the gauge would read full scale.
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In other words if you ground the wire from the gauge the needle should be at half scale.
If the resister was bypassed the gauge would read full scale.
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Thread Starter
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Junior User
Joined: Jan 2009
Posts: 56
Likes: 0
Hmm, It shows L before I turn it on and shoots to H when I crank it... So it could be bypassing the resister all togeather then,,, That means the cluster is probably bad.
Is that correct,,, So no need to replace the preasure switch... it was easy and 6.00 so I was hoping that was it.
Is that correct,,, So no need to replace the preasure switch... it was easy and 6.00 so I was hoping that was it.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Here is a photo of the oil gauge resister bypassed on mine. I bypassed mine and installed and old style sender so I could see how much pressure I had.
Also click on reload at the top of your screen to see the diagram I post of the circuit above if you can not see it.
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Also click on reload at the top of your screen to see the diagram I post of the circuit above if you can not see it.
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Thread Starter
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Junior User
Joined: Jan 2009
Posts: 56
Likes: 0
Could I just solder in a resister and make it work as original then? I can solder a new one in 5mins and have working then
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Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Maybe but your problem could also be a bad gauge. If it is a bad gauge the resister will not help.
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