oil light flickering at high rpm

I would find out the pan's capacity and go from there. Also, IMMEDIATELY after the light flickering, shut her down and pull the dipstick. If there's any foamy lookin oil......then there you go. A windage tray might be in order.

All this, including everything else here is only a guess however, since as far as I know, no one had perfected internet diagnosis skills.

I can say this. If "I" had a manual gauge on something WITHOUT a light and the gauge didn't show a pressure loss, "I" would "keep the hammer down".