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You can get close by initially getting just enough paint on the dash top to cover. Let it dry then lightly dust it from about 18" with the same paint.
Thanks to all that responded. I did find an actual Ditzler Code for the interior low gloss colors for Black. It is 9266 for low gloss and 9317 for Zero Gloss (Flat) This code when entered at your local auto paint dealer will bring up the formula that will contain the correct amount of flattener for each code.
You'd think it would be a slam dunk to take the original lacquer formula and generate a modern equivilant