I found a Cycle Timer Kit available on the web for under $30. I'm considering using it for the 1 min on / 4 min off pump cycle for a Aerospring.
I mention this for two reasons. First, I'm looking for opinions on whether the kit provides a continuous on/off cycle. And, second, in the event someone else out there wants to try the kit as well.
http://www.cpcares.com/CK157X.html