Al,
Do you really want a one-wire? You pay more for it, it doesn't work as well, and you still have to deal with the leftover wires in your harness. I'd recommend sticking with the Delco #7127 three-wire as described on the website referenced above.
The only thing I'd add to Teglerizer's site would be a note about the brown/yellow wire. In your harness, you'll have what appears to be three brown/yellow wires, but it is actually only two. One of the wires goes up into the harness a few inches and then comes right back out again. Just remove this short piece of wire and treat the remaining brown/yellow wire as described by Teglerizer.
If you're a VTR member, you can get more details on the TR web site.