Do oil pumps fluctuate?

[iluvmy72]

1996 Burb 5.7

2007615 miles

Pressure gauge dip coming to stop or goes all the way down after leaving stop with Check Gauge” message.

Changed Oil pressure sending sensor.

Still same issue

Put in a can of sea foam and issue kinda stabilized a day to flush and problem only saw once after.

Had an oil change done the next day. Idle warm at around 40 on the gauge and at times goes to 30. Goes to above 40 on highway. Can oil pump be the issue?

Do oil pumps start to die or do they just die? Also was told this could be a stepper motor issue in the cluster.

There is no noise or rod knocking going on.

Will have a mechanic pressure test it in the next week.