Working on a 68 for friend's mother. It has what I think is probably a 70-71 vintage instrument cluster in it and there are no indicator lights for turn signals in it. So I was thinking of using one of the original red lights from the dash to use as an indicator. Could I wire both left/right into one or would it need to be a dual filament bulb to do that? The stalk no longer (maybe never did) returns after a turn and we're trying to keep her from driving with a blinker on for days.