oil pressure gauge and oil warning light

[racerjim0]

The daughter calls and says her '06 Trailbazers oil gauge goes to zero and then the oil warning light comes on.
The gauge then comes back up in pressure and the oil warning light goes out. No engine noise according to her.
Oil changed a month ago.
This happened several times yesterday on her trip to town but then started working normally and didn't act up again.
This sounds kinda like a sending unit issue except for the intermittent part.
Maybe the wire to the sending unit?
Any ideas??
I don't want my grandbabys to get stuck in a hot car.
Hope all had a happy 4th!!

[DeltaP]

After checking the wiring and circuit I'd put a manual oil press gauge on that engine and monitor it.