Cat passive sensors do not require any external electrical power supply. Output signal is variable resistance, based on a float moving in a column with the fuel level. A pull up circuit is typically used, and helps diagnose problems with wires and sensors. Aluminum components are used for vibration stability and corrosion resistance.Attributes: Visual dial on the sensor Magnetic coupling keeps fuel from electrical signal. Column configuration (top mounted, 6 holes ) Resistance range (95-0 Ohm) Float range - 750mmApplications: Most off-highway Cat equipment Lower output voltage CatA Level SensorsA are application or tank specific.A