First off.... you do realize that the Sustainer takes the place of your neck pickup.... right?? The sustainer is basically just a pickup.... And it's placed in the Neck pickup section of the guitar.... Where it's vibrational effectiveness is the greatest... It's basically an active pickup... all in all... EMG pickups are also active pickups... With all that said, you'd need to follow the diagram that is labeled "Active Pickups". But with the knowledge that unless you have a guitar with a H-H-S configuration (which I have never seen)... there isn't much possibility to have the 85/81 set AND a Sustainer... I'm not saying it's impossible, because it's very possible. It's just going to be hard to find a guitar that can handle that configuration. As far as the wiring goes, if you knwo what you're doing you can do a whole bunch of crazy things and to do what you want to do is very basic..... It dosn't sound like you realize that the Sustainer is actually a pickup that takes the place of the Neck pickup...... You could put the Sustainer in the middle of a H-S-H configuration and have the 85/81 set wired in... But that would defete the purpose of the Sustainer... The reason it's placed at the neck position is because it's the ideal spot for the Sustainer to vibrate the strings... creating the "sustainer" effect........ I suggest reading over that manuel a little bit more to get a better understanding of what the Sustainer actually is........ Like I said, it's not impossible but it'll take a lot of money to route a body to fit your needs.... It's just one of htose situations where you're asking to have your cake and eat it too.... You can easily do it with a single 81 at the Bridge.... a different EMG single coil pickup in the middle... and the Sustainer in the Neck position... that would give you something of what you want.

If I misunderstood the question I apollogize.