The Bully Dog 47000 Auto Nitrous is a perfect add-on to any truck with a GT Diesel Tuner or Watchdog. This Variable Nitrous Kit uses your existing solenoids along with a GT Diesel or Watchdog. It's the only unit that currently communicates via OBDII allowing you to program your trigger points based on pyro, speed and RPM. Keep your eyes on the track and hands on the wheel as this easy to install kit does the rest for you. Features: Clean & Easy To Install Set/View/Change Parameters In Seconds Works With Many Nitrous Injection Systems Includes: Control Module 1 Master Solenoid Relay w/ Kill Switch Wiring Harness That Can Connect Up To 4 Solenoids Once connected to GT or Watchdog you will have: 5 Programmable Stages 5 Trigger Parameters (Pyro 1, Pyro 2, Speed, Boost, RPM) Note: Solenoids, bottle, lines & additional hardware not included.