I had a Beck Spyder losing oil pressure briefly on the Type 1 engine during hard fast corners at the track. All the oil was flowing through the pushrod tubes into the rocker area of the head. I needed to go to a dry sump or run baffles on the ends of the pushrod tubes. I did the later and it worked for my track use. If you are losing oil pressure intermittently with no external reason you have a problem that is going to cost you your engine if not diagnosed and repaired. Good luck finding the issue. Are you using an electrical oil pressure gauge or mechanical ? The sending unit on your electrical gauge may be defective or have a lose wire or ground.