Mattax said

Can't be right.
The prop valve has no wires, no switches, nothing 'lectric.
Only thing close is the brake 'safety switch'.
It's in the distribution block between the front and rear hydraulics.
1967 Chrysler Imperial Dual Hydraulic Brake System from the Master Technicians Service Conference Session 232

I *think* that wire is supposed to be held against the inner fender with a three-finger clip like the one on the alternator.
The connector just pushes on the threaded portion of the switch - just like the gas tank sender.
Inside, somehow it ties to the brake warning light. When the switch grounds, the light comes on.

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ZMan67S said

Already been out taking advantage of the cool morning here 63.
Finished waxing the 55. Funny when I was waxing the firewall I noticed a clipped wire below the master cylinder.
Its a custom engine so hard telling what it is.
Went back and looked at past pics and its been that way since it came back from the shop last year.
I'll figure it out and fix it.

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