Well I (think I) had some good progress this weekend. Finally decided I was more or less happy with my fuel pressure and put it all back together again. Fired it up, hooked up the coolant temperature sensor, cleared the code and took it for quite a drive. Didn't hiccup, no CEL at all. I thought it seemed to be running a little rough when I got back home but I didn't get any codes. Gonna put some more miles on it and tidy up a couple minor things but I think I'll call this one finished. Thanks homies!