Russ,
My A65 is long gone but had the same oil pressure issue after a meticulous rebuild. Read "Mr. Mike's OPRV" at the beginning for the BSA site. This simple mod will positively fix oil pressure. I will even send you one of those OPRV's if you send me a self-addressed envelope. The second new owner of my A65 called me and said the oil pressure is still great. That has been at least 8-10 years ago,
Mr Mike