Here's a pic of the innards. You can see the existing black rod coming from the nozzle fork and going to the electrical box & switch on the right side of pic. Just drill the switch and insert a small bolt & nut. Motor bolts to some angle iron, water meter gears are above motor, this took a little doing but wasn't too bad. Shaft attaches to computer using stock fitting. If you don't have this fitting you can ask around here for one or just get some 3/8th round stock and drill for a drift pin in one end to fit in slot you're now sticking a sacrewdriver in. Hairdryer is that purple thing on the left, just duct taped to the line at existing union and held in place with nylon ties.
Here's a shot of the micro-switch. Probably pick one up at Radio Shack. I removed the roller on top and used epoxy to glue an extended flat piece of metal that extended beyond the switch. This contacted the valve seat inside the nozzle and rose & dropped with activation of the handle. Siliconed the whole thing in place inside the handle so it wouldn't go anywhere once it was in place.
Ken
[This message has been edited by kwilal (edited 06-12-2005).]