Oil gauge went crazy on me!

[90TGP]

Ok, I was drving around today, was hot, in the 80s somewhere. I was going down this hill when I started to slow down. The needle on the oil gauge just shot up past 80psi. It then went down to 40psi and went back up. It did this till it calmed down when I was at the bottom at a stop sign.

When I turned to head home and accelerated, it jumped a little too.

It did this back and forth as I accelerated lightly and hit the brakes on the way home.

Right now it's in the garage cooling down. Maybe it was just really hot?

I know it couldn't be the turbo oil return line, I just had that replaced when I had the cross-x changed.  :?