I don't have a fancy panel, so had no qualms about just using a simple electronic label maker.
You can buy one for under $40, but a buddy of mine had one that I borrowed, so pretty much zero cost.
You can make the labels black on white, black or white on clear, or whatever, using different tapes.
I think they turned out pretty good.
The C180 TCDS & an AD required an extensive placard on the panel, "in full view of the pilot".
I experimented with my computer word processer & printer to get the required sized lettering,
then printed it & attached it with clear packing tape.
Again, not fancy, but good enough for my utility grade panel.
And like the label-maker placards, easy to remove or replace later if required.