I think it's reasonable to assume there's some way of setting the VFR
code, as it varies around the world. 4263 is an internal code allocated
to Albuquerque, I believe, so it's probably a company squawk for a
common user like an air ambulance. I have a KT-79 maintenance manual
but it has no mention of how to setting the VFR code. I'll try to
round-up an install manual to set if it's in there...