(quoted from post at 09:06:33 02/05/18)
Amp gauges don't really do any good, got my first car when I was 16 years old (back in 1981). It had a amp gauge, and even though it showed it was putting out amps (charging). The car in the winter time always cranked really slow, while the charging system was putting out amps a volt meter showed "it wasn't putting out enough volts" only 11.8 volts. After figuring out it was the regulator I replaced the regulator then it was charging 14.6 volts along with the same amount of amps. With the extra (proper) voltage no more slow cranking in the winter time.
I don't see how this statement fits electrical theory.
But then, I haven't taught electrical theory for over 20 years.
I may be rusty.
I thought the original post asked if a voltmeter or ammeter were
wired up the same. The are not, and I answered that question.
After re-reading it, I see Norm also asked about a digital meter.
I don't know of a digital meter that fits an N and works reliably on 6 volts.
I wouldn't rely on analog 12V gauge to read reliably on a 6V system either.
I have both ammeters and voltmeters and I know how to read
both, so I will stay out of that argument. It comes up often.