Don't be afraid of using a one-wire alternator, you can still hook up and use the alternator light. I got this alternator from Summit.
You can also get more information here:
Powermaster
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.