#3
explorerbuilder hit the nail on the head , you can keep the stereo jack in the guitar just make sure the ring portion of the input jack isn't in use. You can take the battery clip out too if it's in the control cavity with the pots.

but 500k pots for humbuckers and ground the strings and you're set.

if they aren't bright enough use 1m (1000k) pots, personally i'd put coilsplits or something like seymour duncan triple shots mounting ring system on these as they are extremely high output pickups and you'd really appreciate the 4 sounds triple shots give you out of the pickups