Engine oil pressure symbol in dash

Hi, Pontiac Montana 2000, 214,000 kms,
Engine oil pressure light is on for last 2 days. Il came on last week for short time and went off. Engine runs ok, oil check ok. Unable to find any loose wires or connections. Manual says oil pressure switch located above oil filter. I was thinking of changine this switch or sensor. Any suggestion would be app.
Hubmen Montreal

I had this problem. Changed the sensor. Simple, requires a large socket. I purchased the sensor and matched a socket at a store.

Thank you Dcarver. I will change sensor. Would u happen to have part number. Thanks

sorry no part number - purchased at dealer. Apply teflon tap for a good seal.

Try this A C Delco #12575007