2 Directly plug and play. Do no need to cut any factory wire of car. Working perfect for break system. For GMC: Sierra 1500/2500/3500 2014-2020, Suburban 2014-2020, Canyon 2014-2020, Envoy 2014-2020, Acadia 2014-2020, Savana 1500/2500/3500 2014-2020, Yukon 2014-2020, Yukon XL 1500 2014-2020.