Turn signal, 7 wire. Turn signal switch assembly, 3" long, mounts on your spark control lever, (The thing you have been trying to use as a turn signal lever all along.) It is a safety feature that is long overdue for people who like to drive their T's. It's difficult to make hand signals with Model T windows rolled up or side curtains on, and most people are no longer taught hand signals in Driver Education classes, leaving a lot of people who have no clue why you are hanging your arm out and waving. This signal is available in two models: 4-wire, NOT incorporating the brake lights; and 7 wire, for use when using your brake lights as turn signals. Complete with 12-volt flasher, easy to follow instructions, and wiring diagram.