Here is a picture of the TPI Harness schematic I modified to help me trace down wires, troubleshoot, and remember how I did it. Also, a GREAT resource for TPI wiring is at Hot Rod Handbooks. The website is:
http://www.hotrodhandbooks.com.au/eBooks/TPI/IX.html
Or the pdf. can be found at:
american-dreams-racing.com/files/TPI%20Handbook.pdf
Another great resource is this guy at ChevyThunder.com
http://chevythunder.com/since_its_inception_in_1985.htm
There are many more - too many to mention right now. Attached are my notes, so far... I had to convert from a .docx to a .rtf, so I apologize if something doesn't look right or is missing. I'll also try to update it when necessary.