Using push/pull pots as 3-way switch?

[WeirdBits]

You're almost there.

Here's couple of ways you could wire it, in both cases the neck volume push/pull selects the single pickup (down for Bridge and up for Neck), and the bridge volume push/pull selects between single pickup or both (down for single, up for both).

Jim's type of layout:


Same result, different way:


Hope that helps.