I no longer have the stock fuse panel so I cant confirm but it sounds like you have a short to ground somewhere in the pink power wire going from the fuse to the guage cluster. The most likely place IMHO would be behind the guage cluster. The short could also be internal in a guage.Looks like its time to break out the old multimeter and get probing.
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.