DEAD completely

If its the ammeter stud(s), when you have time and patience you can look at why its loose and decide what to do about it.
It could be simple like needing a new insulation washer,
https://www.forabodiesonly.com/mopar/threads/ammeter-heating-up.343374/#post-1971170393
Or something more difficult depending the the construction, which varies so not going to guess.
Dodge trucks were plastic housing, one guy rebuilt his like this.
Bullet-Proof Your Ammeter (A 'How To') - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
If it there are signs of melting - then it got too hot, probably from too much current, and that's not a good thing.

Another option is to use a voltmeter. It won't show whether the battery is charging, but will give you a pretty good idea of whether the alternator and regulator are working.,
One of those that plug into the cigerette lighter can get you by if assuming your car has a working lighter.