Morning Data! I did call my local chevrolet dealer. They don't see a part number for the tape, but said their service guys use a tape from lawson. I think its one of those things were the majority of people are just going to use what ever black tape they have on the shelf & call it good. As so much of this kind of work is a hobby of mine, I enjoy trying to make things the way they were from the factory, unless its something that needs to be improved.
When my GTO was finished one of the things I never realized is how much I would miss is all the years of research. Which of course included contributions from all you guys in figuring out correct wire routing, nuts, bolts & endless details in that car. I'll bet you'll feel the same way soon as your car is so close to done.
Its so cool to encapsulate it into a finished product, but you end up with an weird emptiness about it about a year later.