you keep the bill of sale with you and put something on there along the lines of tag applied for....then go to your tag office a.s.a.p.

if they cant get you a tag right then then you need to ask for a temp tag...all it is is a piece of paper w/ a date on it that goes in the tags place....as long as you have a bill of sale all is good for 30 days iirc....i bought a integra a while back and drove it w/ a tag applied for sign for right at 30 days...got pulled over once and the cop gave me no flack w/ the bill of sale