I've been restoring a 1991 Playcraft pontoon that has a 1990 40HP Mercury Classic outboard on it. I got the boat without any keys and have taken the throttle controller off as part of the restoration. I took the key switch out to find a number on it that is 240-2E. I see replacement 2E keys but do not know if this is what I need. I'm confused about the 240-2E number if the key is merely a 2E key. By the way this ignition switch has 6 wires.