[Compatibility] Specifically designed for 2001/2002/2003/2004 LB7 Duramax engines. Fits 2001/2002/2003/2004 Chevrolet Silverado 2500HD / 3500HD, 2001/2002/2003/2004 GMC Sierra 2500HD / 3500HD.
[5-Position Selector Switch] Suits different driving demands-daily fuel savings (Economy), balanced towing (Light/Heavy Tow), thrilling acceleration (Performance), or track-ready power (Race).
[Durability] Knurled aluminum control knob offers solid grip and durability. Heat-resistant wire with split loom tubing resists heat and wear under the hood, ensures power delivery in extreme engine bay heat.
[Easy DIY Installation] Comes with detailed instructions. Wire colors and connector pin locations are marked for a smooth setup (Blue = Pin 69, Black = Pin 49). Professional installation is highly recommended。
[Complete Package] Includes 1 x SOTF switch, 1 x split loom tubing, 1 x black control knob (pre-installed screws), 1 x dial plate, 1 x hex wrench, and 1 x user manual—everything needed to get started right away.