Installing air conditioning to your hot rod? Need a cooling fan relay to operate off of a thermostatic switch and when your A/C is on? The dual activation cooling fan relay kits by Painless Performance are exactly what you need. Only a few minutes for the installation and your cooling fan will come on when the engine reaches the preset temperature of the thermostatic switch mounted in the engine head or when the A/C is turned on. This kit includes: 40-amp relay with mounting base and pre-terminated and printed wire harness (6' input, 4' output), 30-amp circuit breaker protection for the electric fan, thermostatic switch (195 degrees on/185 degrees off) with thread size: 3/8"-18NPT, 1/2" NPT to 3/8" NPT adapter, mounting hardware and insulated terminals. Features simple to use Posi-taps for the ignition and A/C compressor connections.