Sorry Tom, I did not read from the beginning. With the age causing the loss of plastisals in the vinyl, even if you can get it stretched and glued back using the strongest laminate adhesive, it will not hold. The new fuzzy backed vinyls will hold much better but again, the glues do not hold well to the original plastic dash core. Leather to fiberglass is almost impossible to un-glue once installed. Sorry for the bad report. Maybe someone has a solution other than what I have tried.
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