Odd Oil Pressure Symptom

[Rojoryu]

I was at a track event today and when I started the Z to go out for my second session my Glowshift oil pressure gauge was not reading any pressure at all. I figured the gauge or sending unit had died when I realize the oil light was on at the dash too. I blipped the throttle and the pressure instantly began reading normal levels and the dash light went away. I went out for my session and everything seemed fine. After lunch, it happened again so I cut the day short. It’s doing it when the car has a chance to sit for a bit. If you blip the throttle it always reads normally and if you then turn it off and back on it’s fine. Gallery gasket job was performed last year and it has the upgraded Boundary oil pump gear. Any ideas?