I would probably disagree with BenzBoy on a couple of points. Sure enough, if you want leather on your dash, by all means go ahead. If the shape of your dash is simple enough, leather can certainly be an option. On the other hand, dash shapes can be complex, and in some instances, leather is just not practical from a covering point of view, and it can be almost impossible to use it in areas where you have openings for clocks, instruments and fresh air vents.
For instance, take a 1960 190SL. If you want original, yes you use leather. If you want one piece covering the complete dash, it can be done, but it will take at least one full day, if not more, and even then the quality and finish of the covering can be somewhat lacking. That's why I have seen a number of that model with a sewing seam around the instrument binnacle. It's that item that is the source of difficulty.
Dashes that are recovered by a professional in vinyl are long lasting. Ten years is not an unreasonable expectation from a longevity point of view. I have proved that over and over again. My two bobs worth. Regards Styria