I just went out to my truck The flasher unit has 3 prongs two are used the sise by side ones the lone prong is vacant I would bet that one would run the indicater.. On my speedo I have four holes for lights 2 are used as gauge lights one is high beam top and the bottom i presume is the ignition light. No other holes . I also have an extra bulb socket dangling but don't have any use for it It has a grey lead on it indicating it comes from the light switch ... Any more thoughts here....
