Universal Ignition Switch For 6 or 12 Volt.. Here is an ignition switch for your consideration. It is: ACC, OFF, IGN, START (the normal spots) needed for your classic car or truck, boat, tractor or motorcycle. It is 3" long including the stud, 1 3/4" wide at the base and fits a 3/4" hole. This listing is for 1 assembly as shown.