Hi. I just installed SD Hot Rails in my bridge and SD JB Jr in my neck in my '69 mustang and I thought I'd share the wiring diagram I made that allows you to operate either pickup in single coil or humbucker mode. When both are in single coil mode they will act as a humbucker, cancelling any noise.
http://acapella.harmony-central.com/forums/attachment.php?attachmentid=252008&d=1197182565
For anything that's connected to ground connect it to the wire that is soldered to the side of your volume pot.
