Jason,
I agree on both points. However, if somebody really wants an ammeter, the semiconductor Hall effect device, similar to the link above, seems to be the only reasonable approach.
When I was earning my living as an auto mechanic over fifty years ago, I remember using the Snap-on magnetic diagnostic gauges that one just held over the battery cable or generator cable to measure cranking or charging current. Thise still seem to be sold by Snap-on, and are not the same as the the newer clamp-on gauges.
For my current project (a 278 cubic inch 1954 Chevy in a highboy) I am using an alternator and voltmeter. As much of an "old school" person that I seem to be, I have no desire to start battling generators and ammeters again.
