I assume you mean the coil shaped device with the wires attached to it? That is the resistor which cuts the fan speed of your cabin blower when set to low. I've seen several different versions of this item on Panteras.
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.