Hey guys,
I’m having issues today with high oil pressure. I started the car and it’s going to red line 100 psi… let it warm up and drove it around 100psi the entire time. It’s fresh oil, I just replaced the oil cooler lines, everything is hooked up the same. I’m running 0w40. It’s a 2004 model. When I turn off the car it’s staying at 50psi which leads me to think it’s a bad gauge. It’s not dropping to zero until I turn the key all the way off. Where should I start?

Thanks