Yeah use daftmikes. What's cool about daft mikes is you can use a bicolor led, that's in the 64 boy.
When you do build it don't put it all on one pc board, try to use wires and put all the parts in different places in the case.
Oh and also use a multiturn pot for the diagram, it's really hard to get a single turn one to stay calibrated on the right spot. If you can use fixed resistors that would be better but I never got it to work, it works as a voltage divider so you just need two resistors, daftmike got it to work but I had no such luck, I just put in a trimmer.