David,
Why don't you try Dakota Digital?
http://www.dakotadigital.com/
Click on 'Automotive', then scroll down a bit to 'Cruise Control'. They cater to Hot Rods, what they have may work for you.
Michael
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.