I am not sure how we really expect the kettles to understand that zone 1 is not first class (first=1 correct?).
There is normally not any indication prior to boarding about the naming and order of the boarding zones (OK - sometimes there is a garbled message from the GA - but some of the PA systems are hard to hear clearly)
I have often thought that it might be a good idea to have a clear display screen on the GIDs that would list all zones and and what order they are called.
There is I think one screen that tells you where to find your zone # on the boarding pass - but nothing to indicate what zones there are or what order they are called in.