You have to remember that the piezo section and the magnetic section are COMPLETELY SEPARATE. *(I know I've said that 5000 times, but I *still* get emails asking me why they're 'together'.)
The KJG Wiring Mod does NOT affect your magnetic pickup wiring, or magnetic selector switching.
In regards to putting the TZ/AN in:
Double-check your wiring of the pickup selector switch. *Even a clear diagram can be confusing sometimes. *Make sure you have all the necessary jumpers in the right places. *Check to make sure the switch hasn't been "cooked" by the soldering iron. *Also, look to see that some rouge solder hasn't slipped onto a contact that it shouldn't have (those slippery little bastards...).
In Pos.2, the bridge pickup is in Series, so if you're close to fluorescent/neon lights, or a computer monitor, you'll get a nasty buzz. *Also, check the ground wire. *I've looked down many times and said, "Oh...sure would be nice to have THAT hooked up...". * LOL
"How do you take off a DE trem?"
You don't. *:-)
If you absolutely, postitively MUST take the trem off, contact the tech guys at LR Baggs. *They're EXTREMELY helpful, and can walk you through the EXTREMELY COMPLICATED procedure step-by-step.