Fish Tuning manufactures DSP2 switches. They are available for LLY, LB7, LBZ/LMM Duramax trucks. Depending on the truck, they can be used as either a DSP2 or a high idle switch.

Note: For high idle you'll need to cut off one of the pins and likely connect that wire to 12V. Depending on the model, you may need to attach the extra pin to the other wire, so don't cut that wire shorter 8" or so.