starting today my oil pressure gauge will hit rock bottom whenever the car is running or even getting power. but when the car is completely off, it rises to 100. any clue whats happening here? i just filled it up with gas when this started to happen. i checked and topped off the oil to see if that was the problem. it's not leaking.

 

Probably grounded or pinched the pressure sender condenser wire, or have a disconnected condenser and a bad sender.