New voltage limiter questions - 67 Dart 270

In the circle, at the end of the arrow, is the wire that was connected to the old limiter with some sort of adhesive. You can see the adhesive, all crusty and such, on the old limiter in the second picture, above. Look on the metal plug farthest to the right for a discolored, amber-ish streak. That's what I'm talking about.

So that I don't sound like such a newbie in the future, what is the circled part on the instrument cluster called (that is, the thing to which the arrow is pointing)?

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