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oil pressure problem

1K views 10 replies 6 participants last post by  chevyk10 
#1 ·
My oil pressure on my truck is showing low on the gauge. (95 f150 5.8l)
The needle does not move wether it is idling or running down the highway.

Yesterday it was in the middle of the gauge in the normal, now it is to the left of it.
Sometimes it junps right back up to normal though, then drops back down and stays there, even though there is no change in speed or rpms

Any ideas?
 
#4 ·
remove the wire from the sender and ground it...see if the guage goes all the way up, or only goes halfway. Ford has used a retarded setup that used a resistor on the back of the guage so it would only go to the halfway point, and then used an oil pressure switch (not a sender, it is either on or off)

Im not sure if your truck would have that or not

If it does, it can easily be converted to a true guage by removing the resistor and replacing the oil pressure switch with a sender...wiring all stays the same
 
#5 ·
Well I removed the wire and the gauge dropped right off, then I attached it to the ground and it was right where it was yesterday. Horray!
So i need to un-solder the resistor on the gauge cluster amd replace the switch on the side of the engine?

it is a 95, if that helps
 
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