First, remember it costs you nothing to diamond, so if you think it looks good after downloading, come back to give me a diamond, that lets me know that someone likes it after downloading, this took twice the work as the smaller version I made, I know it isn't compact but I couldn't find any other way to do this like this, but still, it works great, just press the button and watch the magic, contains 3 parts, the pistons that make up the first digit, the pistons that make up the second digit, and the numbers programmed, Hope you enjoy and can compact this more or just learn how to make it, have fun and remember, keep practicing that redstone if you want to get this good! Again it counts from 1 to 20 it takes a few seconds to start.