If I'm not mistaken, just about all the higher end computer radios can be programmed to mix any number of channels, so you could actually set things up to turn on your pump, when you start working the channels assigned to run the hydraulic valves. At neutral positions, the pump could be off. And I also remember there being a switch for sensing the need for hydraulic flow too, but I'm not sure who makes it. I'll bet Joe will chime in and tell us.
