1968 Dart Fusable Link?

The wire coming through the firewall (via the plug) should go to the Ammeter on the gauge panel. Does anyone know does it attach directly to the back of ammeter or is it a plug in the back of the speedometer panel. I remember plugging something into the panel but not attaching a wire directly to a bolt.

I thank everyone one for their comments
The ones I've seen have always been ring terminals on the wire, and attach to one of the studs on the ammeter. Sometimes the battery connection is marked + or Red.
The alternator/main splice wire attaches the same way on the other stud.