Five position switch that when used in conjunction with our LLY, LBZ, & LMM Duramax custom performance tuning is used to change tunes on the fly. Specific to 2004.5-2010 trucks. The Keylock DSP5 Switch locks the tune in one position. Tunes may be changed on the fly, but if you need to prevent someone else from switching to another tune, you can lock it into a desired position.
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