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Hi, to help us, add some details of which year and model truck you have in your signature line.
If your gauge was working but now it is not, it could be the ground has been interrupted. The sending unit should screw into the block with nice clean threads on both the block and sender. No teflon tape.
The sending wire should be traced back from the engine through the firewall and to the back of the gauge. Check for exposed wire insulation or corrosion. The oil pressure circuit is pretty short and sweet and is one of the easiest ones to troubleshoot on our trucks.
When you get it working again, look for 20 psi at idle, and about 40 at higher engine speed. If you get more than that, great. If you get less than 20 at idle, engine components could be worn.
Hope this helps, Tom
It’s a 1949 ford f1 with a flat head 6 226ci. It has not had an overhaul or a rebuild that I know of.
I would expect to see 80 psig (pegged needle) at start up on an ice cold engine in good condition using straight SAE 30 or SAE 40 engine oil, but that should be going down as the engine warms up. Does it go down after a few minutes of idling?
I got the sender from Napa auto parts, while I’m driving it’s just below 80, I did see it go down to 30 after udling for several minutes but as soon as I give it gas it’s right back up to 80.
As far as I know, NAPA doesn't sell the type of oil pressure senders used in our trucks. I suspect they either sold you a pressure switch, or a sender for some more modern Ford. Does your sender look like this?
I got the sender from Napa auto parts, while I’m driving it’s just below 80, I did see it go down to 30 after udling for several minutes but as soon as I give it gas it’s right back up to 80.
You have the wrong sending unit. You need one like this, rated for 80 psig.
OP6091 is for a 1970 Cougar.
Even the NAPA online catalog says "not for your vehicle". https://www.napaonline.com/en/p/ECHOP6091
It sounds to me that the sender you have is for a 60 psig gauge.
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