This circuit uses a five-way superswitch. Its drawn for Seymour Duncan humbucker wire colors, since you're on a Seymour Duncan website.
A five way superswitch has four sets of contacts - five inputs and one output or "common"
You can use the sets of five plus one any way you like, but in my diagram:
Set A (top left) controls the middle single coil pickup. It is "on" in P2 (bridge plus middle) P3 (middle only) and P4 (middle plus neck). The common output is linked to the common output on set C.
Set B (top right) controls the auto coil split. The idea is that in P2 (bridge plus middle) the "middle" wires on the humbucker go to ground. You can omit this if you like and just join the red and white humbucker wires to each other, but you won't get a coil split You could, instead, swap one of the pots for a push-pull, push-push (better for Strat knobs IMHO) or a separate DPDT mini-switch
Set C controls the bridge and neck pickups. The bridge is "on" in P1 (bridge only) and P2 (bridge plus middle). The bridge is "off" in the other three positions. The neck is "on" in P4 (middle plus neck) and P5 (neck only) and is "off" in P1, P2 and P3. The common output is linked to set A (see above) to set D (see below) and to the volume pot input.
Set D allocates the tone controls. The common output from set C is linked to the common on set D as an input. The five other contacts determine which tone pot is active in which position. As its drawn, the bridge tone pot only works in P1 (bridge only) and P2 (bridge plus middle). The neck and middle tone pot works in P3 (middle only), P4 (middle plus neck) and P5 (neck only). If you wan the bridge tone pot to work in P1 only, connect the bridge tone pot to D-1 only, and connect the middle / neck tone pot to D-2, D-3, D-4 and D-5.
Pot and capacitor values are your choice. Normally people recommend 250K pots and 0.022 uF caps for single coils and 500K pots and 0.047 uF caps, but it's your choice.
The body and trem grounds are shown going to the master volume pot casing, but in truth they can go to any pot casing of your choice.
One final point, do NOT omit the pot-to-pot ground wires (shown in black). Relying on the foil backing on the pickguard is not a good idea. In time it will tear and the ground connections could be lost.
