Michael, do not confuse the Y/BK 12v(+) for the Instr. Light with the Y coming from the Sensor(-). Your Gauge is supplied with a positive 12v(+) P (Purple) and gets its negative (-) regulated for the level indication by a W/BK and a negative for the low fuel light Y or perhaps in your case a spiraled Y/BK
My Sending unit looks slightly different as it is a combined Sending/Fuel supply..........
diagram:
http://www.panteraplace.com/El...E%20AND%20SENDER.pdf
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.