The amp gauge should jump around (flips from slightly negative to several amps positive couple times a second).
There isn't an obvious fix that I know of, but I might double check all the wiring to make sure something didn't come loose.
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.