Anything vinyl, like the dashboard and upper parts of the door panel, should be dyed, such as SEM spray dye. Anything else plastic (lower dash panels, lower door panels, rear panels and rear deck) should be painted with plastic spray paint. I've had great experiences with DupliColor plastic paints. Do it right, do it once, and use quality products. Adhesion Promoter spray may help in some areas but prep work is important.
I also tweaked your title from "1994 Honda Civic dx coupe dash paint?" for better clarity and attention.