Finished the Chronulator circuit board last night and hooked up some meters. I haven't decided which meters to use yet, so I wired in some old transistor sockets and plugged in the resistors that control the meter scaling. Used the big meter for minutes and the small one for hours.
My next one will probably run on a small off the shelf arduino/freeduino kit with built in USB. That will give me a solid power source and the ability to control the meters from the computer.