Fs2004 Helicopter Dynamic Rotor Sound This Gauge Is An On off Switch That When On Provides A Dynamic Rotor Sound, That Changes With The Helicopter Engines Output So You Can Hear Acceleration And Deceleration In Helicopter Engines, Instead Of That Constant Plain Sound. Designed By Brian Kostick For Fs98 Works Fully In 2002 And 2004. Instructions For Installation By Alejandro Villa
