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If cost is the concern and not originality, I would go with one of the $65-70.00 caps that just pop over the old dash. I have looked at 2 cars with them and they look great...
I had serious problems with those... even the upgraded style. It's not unimaginable for the interior temps to hit 120+. I had one in my 911 and it warped and peeled. Waste of good money that could be spent recovering it properly.
Hey... if you're enterprising and adventurous enough, get some vinyl and give it a go. The dash comes out with a little elbow grease. I watched a local upholstery shop do one. It went like this:
1. Air powered DA to scuff up the surface.
2. Marglass or other quality filler on any cracks or imperfections.
3. DA again and clean.
4. Spray with 3M trim adhesive (both surfaces as per instructions).
5. Work new vinyl onto the dash.
As with any job, prep and tricks will make it good. Prep is listed above. Tricks seemed to include knowing where to start and how to properly pull and bend the vinyl so as not to cause wrinkles and buldges.