pepper,
i just changed mine out and didn't use anything. no problems.
just make sure all the prongs are the same length. when i got my 67 it had an auxiliary starter button under the dash. Previous owner said it was like that when he got it.
evidently, someone pulled on the engine side of the harness and pulled the prong out from the terminal. just enough that it didn't make contact.
unless your contacts look corroded, i don't think you need anything on them.
david
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