this company sells the complete audi factory manuals in paper, but i think only in german.
give them a call or better yet get oli or chris to. d2 s8 is 1000's of pages.
or if you want a specific wiring diagram let me know, i have the latest elsawin with all current flow diagram's and i'll print it.
http://www.audi-handbuch.de/
www.tec-print.de ist ein kommerzielles Angebot der
Tec-Print
Kolpingstr. 30
59174 Kamen
Inhaber: Andreas Volkmann
Verantwortlich für den Inhalt der Website: Andreas Volkmann
Telefon: 02307/236771
Fax: 02307/9109926
Email:
info@tec-print.de
here d2 list
http://www.audi-handbuch.de/A8/index.php
and aqh engine manual 265 pages
http://www.audi-handbuch.de/A8/Inhalt%20J4.pdf
schaltplane is wiring diagrams
or maybe this company for electric interfaces solutions
www.beijerautomotive.nl/
to watch info video,
http://www.beijer.eu/AWS/Contacts.aspx?LanguageID=38