SomoGear AXON -type pressure switch
 
Be cool like all them hi-speed/low-drag SF boiiiis that rock the AXON -clone switches on their decked out blasters. This is the sleekest option for running a single switch to operate both your NGAL / PEQ15 and your SF light.
 
Notes:
Comes with SF-type plug and crane mil-spec plug (SomoGear LA5C UHP) or LA23 mil-spec plug (SomoGear NGAL).