New voltage limiter questions - 67 Dart 270

My fuel and temperature gauges are non-operational. After cruising this forum for a while, I determined that the best course of action would be to replace my instrument cluster voltage regulator (or "voltage limiter" for some). In the pictures, the new limiter is the one on the left, and the old one is on the right.

The old one seems to be original, so its age is a good reason for replacement (if nothing else). As an aside, the PCB hadn't been disconnected before, so all those pins were stiff and super-tight. Needless to say, seven of the ten pins broke off in the process and a new PCB is on the way (from PremiumDashDecals).

QUESTIONS:

1. The new limiter has an extra prong on it that the old one doesn't have. Does this mean I need to run a new ground wire? If so, does anyone have any advice (a) about where I can attach this ground wire to the chassis and (b) the gauge of the new ground wire?

2. The old limiter had some sort of small wire glued to it, and the adhesive broke as soon as I touched it. I think I know which way that wire is supposed to be affixed to the new limiter, but I have no clue what kind of adhesive is appropriate for this job. Any ideas?

I'm learning as I go with this Dart. Before I started, I knew how to change the oil and spark plugs in a car. I'm indebted to many of you for your help, though you may be unaware. If I've failed to explain anything adequately, please let me know and I'll try to get more pictures or more accurate descriptions of the issue.

Thanks!

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