This is almost silly. Many people over the years have "incorrectly" called these an "amp gauge" but your claim that (in the context of a typical automotive ammeter) that it actually "measures" anything is ridiculous.
Ammeters have always been (in cars) a highly inaccurate, relative reading device, meaning, less, more, or close to nothing, certainly not capable of actually measuring amperage
Which brings us to the rest of the "gauges." Since many factory "oil pressure gauges", "temperature gauges" or "fuel gauges" ARE ACTUALLY ELECTRIC METER MOVEMENTS, then just what do you suggest?
I cannot remember the last time I heard someone say "My oil meter is reading low", or "the gas meter is low, we'd better gas up."