[Editor's Note - Ray Montagne, AC6QJ has a recording of the DMV stating the FCC requires the DMV to put a space in callsign license plates. This is a false statement. Unfortunately, this website can not accommodate MP3 files].
My callsign plates, AC6QJ, were issued by California DMV as ‘AC6 QJ’ (space between 6 and Q). DMV in Los Gatos, CA called Sacramento when I complained. Sacramento responded that this is due to the FCC issuing the call sign with a space. DMV had a photocopy of the license in their hands when they provided this answer...