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Old October 3rd, 2010, 09:58 PM   #4
Yota Bill
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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
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