Okay, does the oil pressure sensor only have one wire coming off of it? Mine is a yellow wire attached via a plastic connector with a metal tab inside that has what looks like the head of a nail sticking out. It's kind of loose. I'm assuming it needs to be tight?
My car sometimes shows a little bit of oil pressure but not a lot. Then other times it doesn't at all.

Now on the other hand there is a brown wire right near there coming off of the same wire wrap(of the wiring harness) the oil temp sensor comes off of that has a black wrap around one end like something plugs into it but for the life of me I can't find anything for it to connect to.

 

recrimp a new connector on the oil pressure sensor wire.

 

Just think it's dirty and worn out? There's metal on metal connection. It's just loose.