I am going to overlay my shifter console, but there’s P D N R lettering on the original console (like in the picture), how do you get those lettering back once overlay?

You’ll have to get stickers made to stick over the overlay, or put under the gelcoat since the current markings will be covered
or print on ricepaper or something, and laminate it.
i used these dry transfer decals. i got them at the local hobby shop.
http://woodlandscenics.woodlandscenics.com/show/Item/DT506/page/1