I need to replace the ignition key switch on a Mercury 1970 115Hp Serial #2930000 any Ideas on wiring a universal 3 or 5 post switch and how I would go about it. Or would the factory reproduction switch be the way to go as the posts would line up with original and all I would have to do is transfer over wires over from the same posts. I also need a manuel and would be interested in a original switch if keys were included. THanks PF