what does a coil tap do? and with one, what will a push/pull pot control in each position?
with a HSH config, 1 vol, 2 tone, 5 way selector
A coil tap isolates 1 half of the coils in a humbucker, effectively turning it into a single coil...

You can either wire it up to one or both of your humbuckers, and it would just make them single coils (so your guitar will have the same setup as a strat)