You are buying a brand New Cummins L10, M11 & N14 Celect & CelectPlus (New Style All) Ambient Pressure Sensor 4902720.This part is for all Cummins L10, M11 & N14 Cummins Engines and is required for M11 CPL 1855-6 350 and 370 hp & N14 460hp and more engine calibrations. This part controls the Ambient Pressure signal going to the ECM not the gauuges.. Normally activates Fault Codes 221 and /or 222  on all L10, M11 and N14 Celect & CelectPlus Engines. This replace old style Bolt and Thread on Ambient Air Pressure Kit.