I use a product called Mother. Its in a red spray bottle called " Mothers Preserve".
We have the black dash also. This product is great you can use it on the outside moldings, interior.
Also have a 66 mustang and I use it on the hoses on the engine too.
I have used Armor All but find it collects dust and it really is no good for your dash.
Other guys in our car club also use lemon pledge on the dash.