Jani, a former Longchamp owner was kind enough to send me a copy of the Deauville wiring diagram, which as I understand it is essentially the same.
If you send me a PM with your e-mail address, I will be happy to pass it along. The file is a fairly large scan (over 6MB).
Mark
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.