Just an update...it's amazing what difference two little O-rings can make! After getting everything, including an oil change, done, I took her for a test-drive. I'm pretty sure that I got to full operating temperature, but the oil pressure was noticeably higher. Before, at warm idle, it was slightly less than halfway between the 1 and 2 bar mark, and now it's about 3/4's of the way to the 2 bar mark. Also, before, it would peg the needle at 1200 RPM; now it pegs the needle right around 1000 RPM.

I'm a happy camper