As I see it, the biggest problem with running the original ammeter on an alternator system is voltage drop through the original wiring. If I was rewiring a tractor for a 12 volt conversion, I'd go with a voltmeter because it's simpler to wire than an ammeter and allows the alternator output to be connected directly to the battery with heavy gauge wire. Which is the main reason ammeters disappeared from passenger vehicles forty years ago: high-capacity alternators required a remote shunt for the ammeter, which adds cost and complexity. A voltmeter requires a single small-gauge wire to a source of 12 volts and a ground.
As a diagnostic tool, I prefer a voltmeter. A slight discharge is difficult to see on a ammeter, but is obvious with a voltmeter. It's difficult to detect a failed diode or regulator with an ammeter.
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