My 1979 W123 300D I purchased from a Charity Auction in 1997, with 41000 miles on it. As it appears, the car had been sitting in the baking Southern Cailfornia Sun for over 16 years, until it ran no more and was given away for Charity to get a tax write-off.
The Dashboard suffered a great deal sitting in the sun and has several deep cracks. A 99 Dollar cover was installed, but that one also cracked somewhere between here and Palm Desert years ago.
I am planning to change the dashboard, but have concerns that if not done right, things might rattle later or cause secondary problems. I already have purchased the potentiometer switches and a few dozen bulbs as well as a new clock to be replaced as you go along.
My question is how elaborate is the change of the dashboard? Is it a one day deal, should it be left to a professional or is it not the right thing to do?

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"Schwarzbraun ist die Haselnuss":

1979 300D 234.000 Miles "Brownie"
daily driver,
1979 6.9 Sundays to the Tavern
and car shows "Big Brownie"