A question for those who understanding the intricacies of water cooling. The mighty Spada, and probably heaps more water cooled bikes has a temperature switch on the radiator and a temperature switch that runs from the thermostat housing. The radiator switch controls the radiator fan and I'm guessing is a simple on off type design. The smaller switch in the thermostat goes to the temperature guage in the instrument cluster. Does anyone understand how this single wire conveys constantly variable signal to the temperature guage? Its beyond my tiny brain.