Yeah, just one. And good choice by the way 😉
But I'd SERIOUSLY suggest keeping the electronics intact. Just de-solder the two wires that connect the switches to the control plate. Then remove the knobs with a couple of spoons and remove the pots. Put that whole assembly in a box somewhere.
Then You need to get this lot:
Wiring kit from stewmac - this includes pots, a switch, a cap (which is utter sh!te) and wires.
Shielding kit also from stewmac
New pickups (guitarfetish.com)
Mustang selector switches, You CAN'T use jaguar ones
This means that you get a better sound and less noise from decent wire and good shielding
I'll also do you a wiring diagram with a better switching arrangement.