Early 90s Ford Truck Oil Pressure Gauge?

I was curious on my 1990 F-250 with the 460. The oil pressure gauge only reads in between the quarter and half way mark of the gauge no matter the temperature, if you are at idle, accelerating, or at a constant speed it will just stay there. If you shut it off it will drop to the L obviously. This thing has me stumped. My 95 F-150 when I had it would stay at the quarter mark till you got on the road, then it would jump to over half and stay there.
My old 92 GMC Sierra would always jump to 60 PSI when you started it and drop slowly as it warmed up but never go under 40 PSI when you were driving. At idle it would drop to 20 at normal operating temp. Same with my 95 Silverado. Makes sense because as the oil warms up it gets thinner.
So is this just a Ford thing? Or should i get it checked out?

You really have two options… Replace the sending unit (which may have some sludge impairing it's operation), or plumb in a mechanical gauge. You never know what the gradations are on the gauge with only "H" and "L"… My Mustang used to start and run slightly above halfway, then drop to between the middle and Low marks… It looked like it was barely carrying 10 pounds at hot idle… Well, it turns out the the middle of the gauge was 50 PSI; so the gauge range musta been 0-100 PSI range-wise… Anyhow, once I found out what the increments were, it's actually carrying 30 PSI at hot idle; so I don't worry about it anymore.

Try google it also

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