1D001138 is the newest part number for this switch, superseding GU31768780 and 978854. Oil pressure switch for Nevada Club, Breva 1100, Breva 1200, Griso 1100, Griso 1200 8V 2009 to 2014, Sport 1200, Norge 2006 to 2016, Stelvio 2007 to 2011, 1200 Sport 8V, Bellagio. Thread diameter is 12mm on this item, thread pitch is 1.5.
Note: This is the latest version of this switch, it does not have a "nail head" terminal fitting as the original (discontinued) 978854 switch. Depending on your model, may require a different wire terminal.
Also fitting numerous Aprilia models.