PinkLadyZ

So my z always runs at 60 on my oil gauge and hardly never goes above. Last night the car is running great and I look up and my oil gauge says 90. So I'm concerned because it's never done this before so changed the oil and filter this morning and now it's pegged at 120 when I start it. What in the world is the issue. I've read pleasure value and oil pressure sensor. Which one to do first cause money is an issue right now and my Pink Lady Z is my only transportation. Any help or knowledge would be greatly appreciated. Pink Lady Z