In your message, the key was 'detailed'... there are at least four different wiring diagrams available for Panteras, and I have yet to see a single car that any factory diagram fits 100%. Everyone simply take a diagram and annotates it to fit their own car, based on tracing out the wiring as problems arise. One "73" is in the big white looseleaf repair book that all Pantera owners should have (available from the POCA store and from the usual vendors). Welcome to the wonderful world of limited-production Italian cars!