Installation instructions, 2006 ‐ 2010 LBZ/LMM Duramax Thank you for purchasing the Gorilla Performance digital DSP ‐5 switch! The original digital/electronic DSP ‐5 switch for 2001 ‐2010 Duramax Diesel trucks with EFILive DSP ‐5 tunes installed. This instruction manual covers installation of ...