Oils come a hell of a long way since the 10 lb per thousand rule. Doesn't really apply with today's synthetics, I shoot for an operating range rather than a specific psi at rpm. The amount of breath I've wasted with people requiring 66lbs of oil pressure at 6600 rpm is mind numbing.Old rule of thumb is 10 psi per 1000 rpm hot. Every 90 degree fitting reduced oil pressure by 5 psi - check your routing and fittings - try to eliminate as many 90’s as possible. Then there’s always an Accusump if you’re seriously worried about momentary loss of pressure. Definitely need a High volume pump to make up for extended oil galleys.