Not sure but maybe you could use something like this. http://www.amazon.com/HELLA-H65599011-Windshield-Washer-Sensor/dp/B000VU5G26
I usually just wait until I push the button and nothing happens. Then swear an head to the gas station. it seems to work.
I need a low level float for my Devil's Own water methanol kit I installed yesterday. I was hoping one of the SR5's or something came with the setup stock so that I could just swap in a tank. I have plans to build an aluminum tank, so I may just expedite those plans. I can install bungs for a float, sight glass, and my windshield washer outlet. As of right now, I'm using the stock reservoir and everything is hidden nicely, but there isn't room for a normal sized float switch. You can see one of the injection nozzles on the bottom of the hot pipe though.
