Description The Garrett 771864-0001 Vane Position Sensor Adapter for your 2004.5-2005 GM 6.6L Duramax LLY allows you to install the Garrett 848212-5001S Turbocharger or Garrett Vane Position Sensor on your truck.  Features:  Vane Position Sensor Adapter  For Use With Garrett 848212-5001S Turbocharger Also Fits With Garrett 763527-0712 Vane Position Sensor