Thanks for the welcome! This is actually the third one I've owned. Nice photos (ones I didn't take) can be seen at
https://trcrandall.com/products/1985-guild-nightbird
Bridge, obviously, is a replacement, and I think the tailpiece is too. I thought the bridge was a little ugly when I got it, but it's growing on me.
The pickups are EMG 58's, not 60's that are usually reported. I've found a bunch of the 58s in Guilds from the period. They sound pretty good, but there seems like there's an EQ that's unnaturally inflicted upon them that is pretty apparent when you switch between pickups. They'll probably go in favor of some low wind PAF types, as soon as I figure the best way to implement a ground wire. The "coil tap" is just a series capacitor that gets switched in when you pull up on the tone knob, which obviously doesn't sound like a single coil, but thins out the bottom end, and does generate a useful sound. I'll probably keep a similar arrangement to keep in spirit of the guitar when I swap the pickups