GMC Envoy Oil Pressure Sensor

My Oil Pressure Gauge Started To Go Off The Scale On The High Side Every Now And Then, Now It Just Went All The Way Around Pointing To About...

My Gauge Was Fluctuating A Little At First But Now It Stays At 80 Psi. I Just Changed The Pressure Switch, But It Now Just Stays At 80 Even...

I'm Changing My Oil Pressure Switch And Don't Know The Location And The Exact Tools I'll Be Needing. Looked On Youtube And Found...