Replying to Car Help! Please...

I drive a '96 Jeep Cherokee Classic. 115k miles on it, gets regular maintenance, only "major issue" I have had with it was a fuel pump about 6 years ago.

Last night I was driving on the highway and noticed that my oil pressure gauge was topping out if I was over 2k RPMs. I didnt have much of a choice but to keep driving and so I nursed her back home. The car never overheated or anything like that.

Checked under the hood and there is oil on the top, side, and under the engine block. I do not know much of anything about cars, but this sounds like it could be a gasket/seals or worse.

Anybody have any ideas as to what this could be and potential costs to fix it? ++++k for any help.