In the meantime, seeing you are seemingly fearless, there is a wiring diagram at http://www.pbase.com/portwelland/xjbikes
Rob, I was referring to the Yamaha XJ650G Service Manual ( marked LIT-11616-01-94 and 4h7-28197-10) at page 128 which had the U.S. quarts as well...
there are some great instructions from Dwayne on the XJCD called An Introduction to The ColourTune Plug, with clear colour photos of what to look...
well, so much for the manual.....