Someone should make a panel display
with LED's for all three, and a small digital meter that will cycle
between them.
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Well, that would be a nice gadget, but I do take exception with the
need for an amp meter in flight... All the amp meter tells me is which
is higher in voltage, and therefore pushing the current at that
instant, the battery or the charger - it does not tell me what the
state of the charge is... The battery can be at 11.8 volts and the
alternator on it's last living diode at 12.0 volts, and you will not
show a big discharge on the amp meter, but you are in for deep doo doo,
very soon... Give me a good volt meter any day...
Luckily, aircraft share the 12 volts with autos, and any auto store
will have an expanded scale DC voltmeter that you can plug into the
cigarette lighter... Have one of those in the plane and you can
quickly verify that the alternator is doing the job or not... None of
this waiting for the amp meter to go into discharge to tell you are in
trouble - which is way too late - the volt meter will warn you of
impending problems long before the battery goes toes up...

I have used the voltage reading in the GPS295 as my generator testor
for years now... Unfortunately, Garmin did not include that feature on
the 296 on my yoke, and now on run up I have to lean over and look at
the copilot yoke to check the gennies... There I am, leaning way over
to the right, one hand down on the floor flipping generator switches,
one eye on the tach, one eye on the GPS295, and if my passenger is
young and female, my head between her boobs... Life is tough I gotta
tell ya...

cheers ... denny