Sounds like you have a problem in the starter interlock/override circuit. The override switch is forward in the front trunk. Most people I know have ripped all that out.
See the wiring diagram at Mike Dailey's Pantera Place... http://www.panteraplace.com/El...20AND%20OVERRIDE.pdf
Julian
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.