Hmm.. have been following this, and since I have the original manual on the 77 Spider we just got,Just for chuckles, I brought up the Cardisc and looked at the wiring diagrams for the '74 Spider, and the '74 Berlina. The numbers are not there on the Spider wiring diagram, but they are there on the Berlina diagram. So, the IAP diagram may be an accurate copy of the factory diagram, perhaps the numbers were just never there on the Spider diagram.