Or a person in Japan can do it, because they put their car on consignment. So it's just an individual selling a car, through a business face.
Check the r34 GTR thread in general auto discussion.
Within aust, it's perfectly acceptable to change instrument clusters. You have to notify the state authority of the Kms when you changed it, and the Kms on the new cluster as I understand it. And have a valid reason, which is, it broke.
How many people would check prior to purchase? I know of a work mate that knocked 150k off his Getz prior to selling. Not that I condone this behaviour.