id leave it as well as is messing with tags might bring more prob then whats its worth..
personly if i was to buy a car and the tags looked messed with i would most probably walk away from it thinking it has been a number job or boggie ..
if i seen original tag not messed with would have me thinking its more genuine than not...
im in the middle of restoring my yellow glow capri there's no way id even consider removing the tags they can paint around it ...