Millions of people used to use candles for light. A few thousand lit their house on fire. But it was only a small percentage. Maybe 5-4-3-2-1 per cent. Tell that to the folks who lost their homes. Then Electricity was invented and they "saw the light".
A voltmeter is a little safer, no melted wires or shorting the whole truck out. Same information about charge and battery condition. You can find one that looks era correct or put an era correct face on it. Most auto makers now use volt meter or warning light.
With your alternator, a voltmeter provides more useful information about alternator system performance compared to the ammeter. According to many technical/electrical experts. I can quote the reason if anyone wants it.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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