I picked up a mcmillan U706 liquid flow sensor today and am curious if I could hook it up to the arduino. It has four wires coming out of it. I tried everything and cant get the test light to come on. " Blowing in it and its not blinking like the test pins 12 and 2" Also what would be a good solenoid to get?? http://www.mcmflow.com/pdf/u701-m001.pdf Thank you in advance.