Wiring some new pickups

I guess something like this is what you're trying to do

http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=2hb_1vol_1tone_5way

you'll need to figure out the wiring colours for the BKPs they may not match seymour duncans colour scheme

Trying to find a wiring diagram for this switch, you'd think with the pacifica being so popular there'd be plenty of web support. But it doesn't seem to be the case, and I'd be only guessing at what the terminals are on that switch. You could always buy a switch from axesrus or someone.

If I was to guessing the 3 terminals on the right of the picture would be your main cable for your neck, mid and bridge. The 3 terminals on the left may offer connections to allow for tapping but I think I'd rather buy a switch than go through the process of elimination. A 5 way super switch seems to be the way to go looking at some of the mods out there.