Tom, when you open up the back of the guitar and you are looking at the back of the rotary, you will notice three groups of terminals that share a common bus wire. These groups have thier own pickup lead wire, one for the neck, bridge and middle. Each tab on the switch is assigned to a position on the switch, so each pickup is "assigned" the positions on which they will operate. The group located at the left side of my 6 way switch is for the neck pickup. In order to assign the neck pickup to the fifth position instead of the sixth, I removed the jumper from the lowest tab or terminal of the group, taking the neck pickup out of postion 6. At this point, another short piece of wire with insulation is attached another wire the next terminal up in the group and effectively jumped over the recently disconnected terminal (for position 6) to the next one (for 5) in line after it going counter clockwise, which is unused by the factory and empty of wires or solder.
It helped me to remove the switch from the guitar body to see the terminals that were engaged for the switch positions. I also used an ohm meter in order to verify that the unused terminal put the pickup in at the spot I wanted it to be in, which is the #5 position.
The bridge pickup group and the middle pickup group require no modification.
So far so good on the 490's. They have a very clear sound. I will have to have more time to tell if they stay. The bridge pickup is a little weak at 7.7K, but I like 8.25K, so it's not too far off. I like the combinations they give you, except for the where the bridge by itself was. A 7 way switch would be cool to have all three pickups on at once in addition to the six choices we have now.