the pickup you've got has two seperate coils that can be joined in series or parallel to give different sounds...first you need to decide if you want the coils in series or parallel, and the wire it up as per the diagram that stewart posted. (iirc parallel is normal for a musicman)
so, first you'll need to wire up the 5 wires from the pickup to give your chosen sounds, and then you'll need to install a [url="http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=kill_switch"]"kill switch"[/url], which will turn it on and off.