sitting on fence about amp meter

IF you stick with a low output stock alternator, IF you refurb the bulkhead to absolute perfection, and maybe just solder the two "trouble" terminals together, and IF you make sure the ammeter is in tip top condition, and don't have a bunch of high current accessories installed, you very likely could get by just fine

The problem, though has been with us for a very long time. If you look through some of the old shop manuals, you can find what has become known as "taxi or fleet" wiring, where Ma essentially ran heavier wiring through separate firewall gromments

In my own 70 RR back in the early 70's, I had trouble with the bulkhead connector, and ended up running new conductors through the old bulkhead terminal holes, as they had ..........Melted!!!.......

Have you seen this thread?

http://www.forabodiesonly.com/mopar/showthread.php?t=119480&highlight=ammeter+conversion

It details how you can convert your ammeter to a voltmeter. I can't take credit, I simply copied. I did mine with the Sunpro voltmeter, and didn't even change the gauge needle. It is "slightly" different from the temp/ fuel gauges. I just love it. You can set the cal. pot in the meter so that 14V is right at the center of the old ammeter scale.