oil pressure sensor issue
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Junior User
Joined: Feb 2010
Posts: 77
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From: rathdrum idaho
oil pressure sensor issue
ok i got the majority of my wiring issues figure out what im wondering is i hook what the book shows as the oil psi sending wire to the positive and nothing happens, i hook it to the negative and the guage works. isnt this opposite of what is really supposed to happen? this is on a 91 f350 of what was a 7.3l
Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
No. The dash gauge is connected to + voltage (reduced) and the sender is grounded to the block. If there is oil pressure present, the sender completes the circuit to ground to allow some current through the gauge to move the needle.
The oil pressure gauge system in these trucks is really just a glorified idiot light. They are really not that accurate.
Jason
The oil pressure gauge system in these trucks is really just a glorified idiot light. They are really not that accurate.
Jason
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Junior User
Joined: Feb 2010
Posts: 77
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From: rathdrum idaho
im may just mount the mechanical oil pressure guage next to my fuel pressure guage and call it a day
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Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Hey Jason, haven't seen you here in a while.
I think 1987 was the change over year for the idiot gauge in the F series trucks. Rangers before that already had them even in the mid 80s.
My gauge does read dynamic depending on operating conditions but with no numbers, its still more or less meaningless. There is a way to convert later gauges to dynamic readout but I don't remember all of the details.
I agree that a good quality mechanical gauge is a better choice if you are serious about monitoring oil pressure.
I think 1987 was the change over year for the idiot gauge in the F series trucks. Rangers before that already had them even in the mid 80s.
My gauge does read dynamic depending on operating conditions but with no numbers, its still more or less meaningless. There is a way to convert later gauges to dynamic readout but I don't remember all of the details.
I agree that a good quality mechanical gauge is a better choice if you are serious about monitoring oil pressure.
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Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
Hey David. I went back to work last April (after being laid off for 5 months) and have been working steady since. 
My commute is 150 miles a day, so I haven't had much time to spend on the computer.
Jason
My commute is 150 miles a day, so I haven't had much time to spend on the computer.Jason
