need help diagnosing oil pressure issue

[Viper Specialty]

Three in front of block, three in back, two on top front. Top and back are exterior. It's obviously not them or you would have oil everywhere. Front three are behind the cam gear, you may be able to get a view with a small mirror.

[ticklechicken]

I got the car put back together a week ago, and it has oil pressure now. I drove it this week, and the problem hasn't come back. Unfortunately, I have no idea what I fixed. My new oil pump didn't fit (too thick), so i put the old one back in. After verifying oil pressure, I put the old sending unit back in to check it, and it works fine. The dash light is working too. Everything seems to be working, and I didn't change any parts. This convinces me that I actually lost pressure weeks ago, and it somehow came back. Puzzling, and a little unsettling.

Good news is that I finally got my power steering pulley swapped out while I had everything apart. Bad news is that my a/c doesn't work after reassembly.