Fusible link guage?
I think the ammeters on ours cars are getting a bad rap. Most of the time, it's not the actual meter that is the problem. They're a real simple gauge and very trouble free. Most of the problems are in the connections on the back. They can become loose and the wires can then swing around and/or the posts can short out against the housing. Adding high powered sound systems can throw everything over the edge too but you can't blame the ammeter for that even if it's the first thing to fail.