[rotorwrench]

KS was ingenious in how they designed their system to translate the float buoyancy to apply mechanical pressure through a sealed diaphragm to a bimetallic strip with a contact points set to affect a current controlling pulse rate output. The speed of opening and closing the circuit was directly affected by only a small amount of mechanical pressure against the very small bimetallic strip. It all fits inside a small sealed cavity in the sender head. It includes the little resistace spool of wire and the small carbon resistor for calibrating the system to the bimetallic indicator gauge. The sender head cover can be pryed up and off to reveal the internal components of it. The points can be cleaned if a person is very careful. They don't wear out like a rheostat sender and nothing electrical is exposed to the inside of the fuel tank. Thay last longer than all the other systems I've ever worked on and that includes the capacitance based systems. The only system that is more simple is a directly viewed float type system like a model A has but those aren't practical if the tank is remotely mounted. The fuel tank has to be very close to the operator of the vehicle.