no idea why he would do that. Now im not saying that for your particular set up its wrong. (it seems wrong!) but I don't really know. I have seen the first connection your missing not in use on a particular set up (it was by passed or w/e) but don't ask me as to why. (car for sell section the guy with the 700hp baby blue beast)
anyhow here is a link to the tsrm vacume routing
http://www.cygnusx1.net/supra/TechTi.../vacuum_2h.gif
this one will help too.
http://www.cygnusx1.net/Supra/Librar...spx?F=1708&P=6
good luck man. post any more questions you have.