What is the difference between a sender and a switch?
A switch creates a situation that is all or nothing. That is, it allows current to flow or not to flow. The current that flows is not graduated, and is suitable to actuate a pilot light. A sender gives a variable signal of graduated intensity that is suitable to actuate a gauge, indicating a certain level. Our temperature switches have a mechanical contact that is actuated on or off with changes in the temperature surrounding the switch. A temperature senders have a resistive element that varies depending on the surrounding temperature. The temperature sender provides a resistance value to the gauge causing the gauge to fluctuate.
