Hi Bob,
This was sure a tough item to take a picture of. The throttle bracket played havoc with the auto-focus.
Attached are two photos of the clip after the grease was removed (04B LOS).
The clip definitely has a black covering and the wires are in the same type of tubing as the water temp sending unit wire (well...for 67 anyways) . I attached a photo showing a closeup (sorry it is not clearer) of the thick drip from the dipping process. The coating feels hard but that is to be expected after 52 years, I guess.
Hope this helps!
Mike