I had to do that on another vehicle of mine that I was unsure about the true oil pressure.
I bought a Sun gauge that you would normally install under the dash. I disconnected the sending unit to the dash gauge and installed it in the same fitting. I just left the gauge under the hood while I tested the pressure at different rpms and temperatures until I was satisfied that my oil pressure was adequate at all ranges.
You could do the same thing with your truck. follow the oil tube from the dash gauge back to the engine. It should be on the driver side of the block.
Now that I'm thinking about this, reverse my two suggestions. You should be using heavier weight oil anyway, so change that first and see if the gauge on the dash shows higher psi. Is your engine newly rebuilt or is it 70 years old?
Last edited by Otto Skorzeny; 04/28/2023 4:14 AM.
