I picked up a tube of dielectric...
and a set of dental picks and micro files too clean it all up.

my guess on the black gue is that it is an old type of silicone that sealed the connection.

...
pain in the *-%( pulling theolddash and wiring.
took 30 min at the junk yard.
almost 3 hours just to pull mine!

guess I know what I'm doing tomorrow