Ok so I'm using this diagram http://www.guitartechcraig.com/techwire/tech18.jpg to wire up 2 P-90s and a humbucker. I'm using 3 tone and 1 volume as well as the 5 way switch and the double pole switch like in the diagram, though I am not sure where I connect the pots. So does anyone have any idea about where they are to be connected? Also, I don't really understand the concept of grounding, do I have to solder wires to the body?