This is a complete test kit ready to use which includes: IPR Plug with o-rings, ICP Sensor air fitting with air shut of valve. CNC Machinined in the U.S.A. Simply remove IPR from engine, replace with IPR Plug. Then Remove the easy to get to ICP sensor, install the air fitting. Kit includes: IPR plug with o-rings, ICP Adaptor, Air shut off valve and standard quick connect fitting.