after haveing drove a lot of the early chryslers with amp gauges. and now driving a dakota with a volt gauge i like the volt gauge much better. an AMP gauge only shows the AMPs being used. has nothing to do with the battery volts. IMHO
Voltmeters are certainly less ambiguous; with an ammeter, you need to know what it will do under a variety of situations; it can give the same indication in more than one situation and mean different things.