I've got a 2003 Chevy Trailblazer with the 5.3 V8. I just noticed the other day that when I start it the oil pressure gauge immediately shoots way to the right and stays there roughly at 80. When I shut it off it goes to 40. It used to be at 40 with it on and go back to zero on shut down. I looked around online and it appears there were some issues with the gauges that were reported. No other warning lights or anything is on. Is this something I should worry about?