I put my gauge face stickers on with nothing. What I do is stick the sticker to a knife blade on one edge and carefully position it and then drop it in place. It takes a steady hand. I did get one misaligned slightly and was able to pick it back up and reposition. I was sweating a bit on that one, with the possibility of having to order another complete set.
My leftovers that I was saving were sitting on my workbench with some other stuff and when I was welding on the cab (~5 ft away), a spark got that far and started a small fire

The 0-80 mph speedo, odo, -50 to +50 amp, and 100-220F temp stickers are still usable in case anyone needs a spare (freebies)