Dave,
I'm not sure how fussy you want to get but on both of my 73's the oil pressure wire is inside a 1/4'diameter (approximately) black plastic tube from the wiring loom to about the last 3" before the sender. Of course the plastic is hard and brittle after all these years and I removed mine as yours and many others are.
Jim Cain
#5774
#5432
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.