three excellent tried-and-trusted guides to offboard wiring. three slightly different ways to do the same thing.
choose whichever you get along with best.a guide to offboard wiring by mark, here at gfx, that works with all the layouts listed here.
http://tagboardeffects.blogspot.co.uk/2012/02/offboard-wiring.htmlwiring a stompbox by gaussmarkov (with detailed graphic illustrations that illustrate the entire process step by step).
http://gaussmarkov.net/wordpress/thoughts/wiring-up-a-1590b/and from the always essential beavis audio:
https://web.archive.org/web/20150315021440/http://www.beavisaudio.com/techpages/StompboxWiring/and a video by way of eye candy...
worth checking out the other videos this builder has produced too, an excellent resource.