RustBucket wrote: ↑Tue Nov 27, 2018 1:44 am I'm not an electrical engineer so I stand to be corrected, but...
...and our roadsters ammeter design without the resistor (shunt) is the inherent flaw and the cause of the melting.
Rustbucket
In reality, the ammeters rarely fail - look at the size of the wire - its larger than everything else in the wiring harness. If something does fail it would typically be a solder joint. That is likely by design.
If the solder melted due to excess current - as pointed out earlier, it acted as a fusible link sacrificing itself to prevent complete meltdown (and fire) of the harness. Smart.
Unless you have a lathe and a way to replace the bezels, suggest you just replace it and be done with it. Plenty of used one's around - If you don't want original just get a Stewart Warner and you'll no longer have a concern.