The 2016 Manual says it's on the end of the light stalk similar to [<-O+>]From www.fordservicecontent.com/Ford_Content/Catalog/owner_information/2016-Transit-Owners-Manual-version-1_om_EN-US_06_2015.pdfINSTRUMENT LIGHTINGDIMMERE175219Press it repeatedly or press it and hold ituntil the desired level is reached.Note:If you disconnect the battery or itloses charge the instrument lighting willreturn to its brightest setting