Older vehicles, tractors, etc. used ammeters because they were cheap. And they did a good job indicating condition rate of charge (or discharge) of the battery.
Newer stuff indeed uses a voltmeter instead of an ammeter as they are cheaper/simpler to connect (voltmeter wiring does need to be sized to handle full alternator output). And if you know how to interpret it, a voltmeter provides an excellent indication about the state of the battery and charging system.
Ideally you would have BOTH an ammeter and a voltmeter in the dash (my old Kenworth does....) as this provides the most complete information about the state of the charging system. But either meter alone does job.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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