These Special Plugs and adapters are needed when you remove the vacuum pump on the GM LT Gen-V - 2014 & up engines. When the vacuum pump is removed, it exposes two passages in the oil galley. These passages are metric straight threads and they need to be plugged, or used for an oil pressure gauge, or pressure sensor w/ the Holley EFI system (i.e. Avenger, Terminator X, HP, or Dominator). Choose from an adapter w/ the 1/8" NPT Female Port, (2) Plugs, Adapter & Plug, or Oil Pressure Sensor for EFI System w/ Plug.
