04 silverado 5.3 low oil pressure

sounds like oil pump took dump on you. get a shop call on that tow and Do NOT drive that vehicle unless you want to sell out to junk yard with clean title

Hello so recently last week I noticed my truck had dropped oil pressure a bit from 40 to about 35. I did some research and figured I should check the pick up o ring. So I dropped the pan and found a decent amount of sludge from lack of maintenance from previous owner. So I went ahead and changed out the entire pick up tube and cleaned the oil paint spotless, new gasket sealed up good to go. Started it and my pressure was back and raising as I drove it, problem solved!! Next day I drive it and notice pressure is bouncing a tiny bit nothing below 35 so I head home to a oil leak on my driveway automatically assuming gasket I look under and find that the under side of the truck was covered in oil. Not from the gasket as it was dry all around. Between work and home didn’t have the time to diagnose it I took it to my well trusted shop with amazing reviews for years. They came to the conclusion that it was the oil pressure switch was leaking so I went ahead and had them replace it (was not leaking before changing pick up tube) so today rolls around I pick it up after they had closed due to getting off work early start it and find that my truck now has oil pressure below 20 and doesn’t go above 25 when I’m driving . Would this be a faulty pressure switch? Maybe another issue? Any insight is helpful as I called the owner personally and he says it’s probably fine and that those guages can be off sometimes. I don’t think so as it has always idled at 40. Don’t notice any drops since I’ve been home.