On our 1987 it was an ordeal because the decal was crazed into little pieces. If yours isn't that bad, try a heat gun and see if it will peel off in strips.
3M Vinyl Stripe Remover, 3M Adhesive Remover, heat gun/putty knife all were of some use. The heat gun and plastic scraper turned out to work best on the vinyl once I got the hang of it, then the adhesive remover for the residue. I know you'll have fun with this ...
Dan & Liz H
"I'd rather be happy for just one day than miserable for the rest of my life."