if you are wanting just one switch the go between the channels you will need to buy a on-on DPDT
toggle switch. That switch has 3 rows of two lugs on it.
To wire it up with one 2-way DPDT switch you will have to do as follows.
1. install stereo jack.
2. locate bridge and neck pickup hot wires.
3. locate the tip and the ring of the stereo jack.
4. connect two seperate wire from the tip and ring.
5. here's the bridge pup wiring. choose any two of the outside lugs on the DPDT switch.
it should lok like this.
- - bridge
- - not used(may be used as a ground, not sure)
- - neck
6. here's the correct wiring.
Bridge Pickup Hot - - Tip from output
- -
Neck Pickup Hot - - Ring from Output
7. Then just ground everything.
if you cant understand what i wrote i will draw something.