I think I can be pretty sure I'm not getting oil pressure from the fact that the oil pressure gauge worked before I resealed the front, I didn't mess with the sender and it was empty of oil for quite a while while I worked on it, and then I didn't try to start it for quite a while. So, the sender ought to still be working (I hope). Also, I think I've read that the sender is designed to fail in a n "indicate 5 bars of pressure" mode.
That and it had quite a "no oil" sort of sound when I started it. Hopefully not a "I bent all my valves sound," and more of a "no oil/empty lifters" kind of noise. Seriously, though, I checked the timing marks and it is still on, so it is just not building pressure yet. I'd go put John's suggestions in to practice, but it is dark and I'm working outside.
And reading this again, I'm not trying to be snotty or anything. I've been there when you think something is wrong and it is nothing. Like when I thought I had a hunting idle becuase the engine was sort of rough and the tach bounced all over the place. I was afraid it'd redline accidentally, but then I cleaned the bellhousing ground and everything worked fine.
I felt silly after that...