The Diesel Stage 1 System includes an adjustable boost activated switch as well as a Wide Open Throttle switch. Operation is very simple: the system starts injecting when both boost and WOT (wide open throttle) switches are activated and it injects a fixed amount of fluid through the nozzle until the switch opens again. This makes it a good choice for low to medium boost setups looking for a cooler intake charge. System includes: UHO (Ultra High Output) pump, 3-quart reservoir, nozzles to cover a wide range of horsepower, WOT (wide open throttle) switch and boost activated switch, required hardware needed for installation.