It is a pretty confusing system to me. The indicator arrow has no function at all except to remind you which tank is being used. And I have a hard time remembering if I manually switched it when the tank being used changed, basically meaning I usually don't know which tank is empty. Our tanks have small gauges built in, but they appear to be of marginal accuracy. I'm glad the tanks last a long time, as I only have to face this dilemma infrequently!
|