Wiring Kit: Universal automotive electric fan 5-pin 40A relay switch harness kit. 14AWG size wire powers 1-2 cooling fans or 12 volt auto accessories. Maximum 30 amp continuous draw with 30A in-line fuse protection. A/C override or manual toggle switch wire built directly into harness. Installation instructions wiring diagram and components included. Thermostat: Universal single pin electric cooling fan grounding thermostat switch. Standard NPT sized solid brass thread-in temperature probe sensor. Preset to power fan or 12v accessory at the selected temperature. Threads into block port radiator engine cooler or tapped hose line. Measures temp of any liquid including oil water and coolant fluid.