GM 700-R4, 200-4R, 180C, 350C etc. Universal Adjustable Vacuum Switch with adjustments from 6" to 22" of vacuum from Superior! Useful for 700-R4, 200-4R's and other units working without computers and needing help getting lock-up in and out at the proper time. Unlike the GM vacuum switch, this switch allows the vacuum trigger point to be adjusted between 6 to 22 inches of vacuum. This switch can also be wired-in to be normally open or closed.