why is my oil pressure gauge pegged on high? 2003 GMC Sierra 5.3L

What is your question?

I have noticed that my oil pressure gauge is pegged to High. I don't even have to start my truck, just turn the ignition on. Of course it is stilled pegged after I start the engine and drive 45 miles like I just did yesterday. When I turn off the ignition it goes back to Low. I checked my oil level to see if that was affecting it but it read normal. Thanks for your help Alan

What makes this problem better or worse?

N/A

How long has your 2003 GMC Sierra 1500 had this problem?

I just noticed it recently