Check out my site. It has all you need to know about the 3T GTE wiring etc. You can make your own loom from the diagram, but you need the AFM, dizzy and coils for it to run on a standard ECU. The engine will run fine without the knock control and pressure switches.
If you don't have a standard ECU etc, you may as well get an aftermakret system. It will be better than the original 3T GTE system and much easier to get hold of.