Definitely. A voltage gauge gives you the status of the charge in the battery, and an amp gauge just tells you how much power is flowing. Sort of like the difference between knowing how much gas you have (voltage gauge) or how much gas you're using (amperage gauge). I like to know before the gas (or electrons) run out!
One more point, since all the power flows through the amp gauge, if it fails open, you have complete shutdown - not a good failure mode on a cold, dark night.
