Bypass ampmeter through bulkhead
I just connected the wires together under the hood, taped it up, and called it a day. It bugged me that the gauge didn't work, until I realized that the only reason I was looking at it at all was because it didn't work. I have AAA if something goes down, and 99% of the time, I get a warning via some other method that there's a charging problem.
I ran the alternator wire straight to the stud on the starter relay, and if I want my ammeter, I'll punch a hole in the firewall and wire it direct. I don't miss it.