Not very many pickups are tappable, but most are splittable. Your post is rather vague. What kind of pickup switching did you want to do?
With VTVT, there are two ways to do it. Normal wiring causing tone control interactions, making it effectively useless. The only way to isolate the tone controls is by adding resistors, like the early stacked knob Jazzes, but the tradeoff is a loss of output.