oil pressure gauge mapping
Junior User
Joined: Aug 2002
Posts: 57
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oil pressure gauge mapping
I dont' think any of the stock Ford gauges "map" to anything LOL!
But yeah, your op gauge will read anywhere in the Normal range above 4.5 lbs. Below that, it reads zero. It's an idiot light disguised as a guage.
But yeah, your op gauge will read anywhere in the Normal range above 4.5 lbs. Below that, it reads zero. It's an idiot light disguised as a guage.
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
oil pressure gauge mapping
The fluctuations are due to electrical resistance. The cluster has a 20 ohm resistor in the circuit to put the needle in the normal range, making any additional resistance at the connections move the needle around.
Jim
Jim
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Mountain Pass
Joined: Apr 2001
Posts: 198
Likes: 0
oil pressure gauge mapping
So the resistance at the connections is varying daily as I drive? Sounds like a bad solder connection but I've had an 87, 89, 90, and 93 and they all _appeared_ to be working.
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
oil pressure gauge mapping
My '94 jumped around within a range for no apparent reason. The push-on connection at the sending unit is one possible trouble spot.
Since it is NOT a real pressure sending unit, as long as it does not indicate zero, you have oil pressure. I know this is hard to stare at it while driving and mentally accept what is really going on. The only real fix is to jumper the resistor and install a REAL pressure sending unit. Except for some passenger car models, Ford did this from about '87 on.
JIm
Since it is NOT a real pressure sending unit, as long as it does not indicate zero, you have oil pressure. I know this is hard to stare at it while driving and mentally accept what is really going on. The only real fix is to jumper the resistor and install a REAL pressure sending unit. Except for some passenger car models, Ford did this from about '87 on.
JIm
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Elder User
Joined: Jul 2001
Posts: 937
Likes: 0
oil pressure gauge mapping
Buy a "real" mechanical gauge. It'll have numbers. There's a concept. It'll read real-time and respond very quickly. Ground the wire for the stock sending unit or the check engine light will stay on.
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