Ali...I think the thread is about radiator overflow level, not wiper fluid.
I remember seeing this thread a long time ago and thought it was a good idea. Problem is there are so many good ideas and not enough time to do anything with them...
With the holidays, maybe I'll take a run down to the radio-rat and see what I can dig up. Shouldn't really require any special sensor--it's just detecting fluid level (much like those you see advertised for your leaking hot water tank at home). But where to hook up the indicator light now... :
Tom