as for "calibrating" the gauges, you really need to be vary familar with Kirchoff!
http://www.panteraplace.com/page205.htm
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.