I am building a Frankenstein bass with a passive MusicMan style pickup. What I would like to do is the following: Have a three-way selector switch that will select: (1) the front coil, (2) the back coil, (3) both coils. The output from the switch then goes to to one volume and one tone control. How do I wire this? 250K pots OK? Thanks in advance for any and all help!