If I was starting from scratch on the electric wipers, I would look for something with more like an automotive control, 2 or 3 speed and or with some time delay, and then a switch so they could both be on the same control, or could independently be on. Like, main control on and passenger side could be on the same control, or could be off and the helm side could be off and passenger side on.
I know that sounds complicated but my system has each side individual, (either on or off, no delay or speed changes.) And, there are times when only one side is getting spray, not the other so individual is good, but a momentary switch that is easily accessible would be great.
Harvey
SleepyC :moon