Oil Pressure gauge freaking out

New motor, didn't do it before and I don't know what changed, I'd be scared too.

For me it wouldn't be a big deal to pull the pan and remove/inspect change pump.

I'd be looking at valve train covers off and running. If it had a lifter uncovering the groove it may do the same thing, but I don't know how to check without Intake removal.

If you do pull the pump check the oil block off plug is tight and in at the correct depth.

I'm really scratching the head on this one.