Sorry about the tittle is a 4PDT
This what is looks like.
I had a music shop wire my guitar up a few years ago they used a Dimarzio On On On switch in place of a Gibson style toggle Switch.
The is the second guitar I have wired from scratch the first being a Parts Caster
I did everything from copper shielding to star grounding, It was a great success.
I decided to do the same to my other guitar but I have no idea how to wire the switch correctly.
Both pickups work but when I put the toggle switch in the middle position I only hear one pickup.
This is the full diagram except mine is star grounded.