Percy, there are at least four different schematics- one was in the original Owner's Manual. Most of us use the schematic dated closest to our car's build date, then annotate it to fit exactly. This helps on the second of such problems. One original early schematic (2 pod dash) has a photo on its reverse side of the back of a removed dash with all the wiring installed, with its own typed color code. Pretty clear shot, too. Don't remember which schematic it was but they're all available for free download to members in the POCA Web Archives.
Could be worse: one of my aquaintances has two Bizzarrini Strada 5300s- one early, the other from near the end of the line. There are NO schematics at all for these cars, and the late car uses all white wires! Whenever I have Pantera wiring difficulties, I think of him....