This is a very simple way to achieve the Neck/Bridge and Neck/Middle/Bridge combinations. If you use a push/pull switch on one of the pots it won't even alter the appearance of your guitar. I've seen this one so many different places that I won't even try to attribute it to anyone.

A simple variation of this is a "bridge on" switch (simply move the red line from the "N" terminal to the "B" terminal below).  That variation offers the advantage of tone control in the neck/bridge position.  (Thanks to a contributor, unfortunately I've lost the e-mail so I can't give you the credit you deserve, but you know who you are.)

Switch shown may be a SPST, SPDT (on-none-on), or 1/2 of a DPDT (on-none-on) as shown. If you replace one of your pots with a 250k audio taper pot with a push/pull switch this modification won't change the appearance of your guitar.

Switch	Knife Switch	Pickups Selected
off	1	neck
off	2	neck + mid
off	3	mid
off	4	mid + bridge
off	5	bridge
on	1	neck
on	2	neck + mid
on	3	neck + mid
on	4	neck + mid + bridge
on	5	neck + bridge