I recently purchased a D-Code July 64 dearborn built convertible without an motor.
Something I didn't pay any attention to until removing the speedometer housing was it had am alternator warning (ALT) light not a generator that I would have expected. I know from reading many other posts about things like this that some items made it into later models earlier than documented. It also passed through my mind that the fascia may have been replaced though the gauge housing screws looked to still be original and unremoved before, the original date stamp on the housing has July 22, 1964 so it's not from a later model.
So rather than try and deep dive every possibility, does anyone else's 64.5 have this. a ALT warning list instead of a GEN.