Ford trucks of this era had a Y shaped starter cable with the trigger wire built into it.
That would pretty much be the grail.
I think Rick, or someone, has this setup.
It's been a while, but I remember the photos.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.