Integrated circuit board construction Kit includes all of the components for single fan installations. 160-210 degrees F adjustable thermal switch module with unique silicon chip temperature sensor that ensures accurate temperature readings to within +/_ 1 degree F. Pre-wired module wiring harness, fuse block power taps, in-line fuse holder with 25 amp fuse, wiring diagrams for single and dual fan applications and illustrated instructions are included. Dual fans require an additional relay (771-18902), sold separately.