It's the same as the Mighty Mite switch so you could see if they have a drawing. But if its the one I think it is, with the green or tan circuit board and the box around it, it has 8 posts on the bottom. The two middle posts are the hots. One is for the right side of the switch, and one for the left side. It's just two 4 pole switches in one. Each side has a hot and one lug for each position. The easy way to wire it for 3 way is to jump the two middle hots together, and take that to the volume pot. On one side, connect one pickup to the two outermost posts, and the other side, the two posts closest to the hot lug. So then you just have to figure out which side gets the neck and which gets the bridge. You can do that by using a continuity tester, or just wire it up and if it's the wrong way, swap the pickup leads.