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I have a 1978 F-150 with the 460. Engine runs very well. But my oil pressure gauge runs between the first line and the N in the NORMAL lettering.
Even if if I turn the key only to the ON position, without the truck running, it reads exactly the same. It doesn’t really fluctuate up or down with RPMs.
I'd suspect gauge and or sending unit isn't working. But I'd also jump on it immediately. Sending units are cheap and easy to replace. I would replace the sending unit, and get a cheap aftermarket gauge. No need to mount the gauge, just hold it down with windshield wiper while you test drive. If the pressure is good, then you can either mount the gauge somewhere, or figure out what to replace in the gauge cluster. If your oil pressure is really low, then.....
Do the rest of your gauges work? We all know the ammeter does not really move either. X2 on sending unit cheap and easy to replace. X22 on aftermarket gauge tap in. 351M for in idea. I am not 100% the sending unit on a 460 is on the back side of the intake manifold (the rear part of the block) like a 351M.
77&79F250, that's exactly how mine is set up. I kept the dash gauge working just for esthetics, and installed several other aftermarket gauges for peace of mind.
1979 with a 460 here. Mine definitely moves. When the truck is cold and not warmed up yet, it goes up to around the "A" in NORMAL. It slowly comes down as the truck warms up. Once the truck is fully warmed up (especially in the summer) and I'm idling at a stop light, it will hover just around where your picture shows. Usually goes back up a bit once I start to drive again (not idling)
1979 with a 460 here. Mine definitely moves. When the truck is cold and not warmed up yet, it goes up to around the "A" in NORMAL. It slowly comes down as the truck warms up. Once the truck is fully warmed up (especially in the summer) and I'm idling at a stop light, it will hover just around where your picture shows. Usually goes back up a bit once I start to drive again (not idling)
Typical. When oil is cold, pressure is up. Once it heats up and thins out, pressure drops. My 400 is around 80 psi at start up on cold mornings. After the oil hits 175 deg, it'll cruise 60-70, idle at about 30 psi.
Do the rest of your gauges work? We all know the ammeter does not really move either. X2 on sending unit cheap and easy to replace. X22 on aftermarket gauge tap in. 351M for in idea. I am not 100% the sending unit on a 460 is on the back side of the intake manifold (the rear part of the block) like a 351M.
Brother, did think about how your vacuum gauge is plumbed? You're only reading vacuum from one cylinder. Number 4. It'll be about the same for all 8 if everything is working right. But if you develop a problem with valve, rings, or cam lobe on the other 7 cylinders, you won't see it in the vacuum gauge. And yes, I plumbed mine the same way at first. I moved mine to the base of the carburetor so it shows full vacuum. EDIT. More correctly, since that's a dual plane intake manifold, the gauge is reading full vacuum from 1, partial from 4, 6, & 7. Nothing from 2, 3, 5, & 8.
It's most likely not the sender. It's the voltage regulator on the back of the instrument panel causing low voltage to the gauges. Does the rest of the gauges read low and slow?
It's most likely not the sender. It's the voltage regulator on the back of the instrument panel causing low voltage to the gauges. Does the rest of the gauges read low and slow?
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