[DHARROD]

My suggestion: Tape off the area (I mean the area - plastic too) - use 3M tape but don't get a long range grade - one that is meant to be taken off in 2-3 days so it has plenty of stick but still not enough to affect the paint. Get a high grade paint thinner (I use Nason 481-16 Select thinner [not for painting]) The thinner I mentioned will take the paint off - it'll work through POR-15 and even start to work at an epoxy garage floor .. but it'll take the paint off in a manageable fashion. Use a rag, coat the rag, but sparingly - just so its damp .. you don't want it to be full of thinner. You'll have to keep adding a little thinner to the rag. I'd use a cloth hand towel that's not like bed-sheet so you can get to the tough spots at the edges of the raised numbers/letters. Use just your finger to polish the paint off.. don't ball up the rag and start scrubbing.
If the plate is aluminum/stainless .. while things are taped off work through a polishing sequence (3M/MGuire creams) like you would just after wet-sanding. You'll end up with a shinny/mirror tag. I've done this on two Chevelles .. tag is on the cowl area though.