Attaching Tag Not Assigned - Tampa Ticket Attorney Blog - Fight Your Tampa Traffic Ticket
That's what I got from the Google box. Basically you may be able to get out of it if the cop technically didn't see you do it. However since you said you told the cop your story I'm guessing it's too late to play dumb and deny everything. Jail time is possible, as is probation but you're more likely to just get a fine, as long as your record is pretty good. You're better off driving with no tag then with the wrong tag.