It looks like an Amphenol Superseal 1.5 series connector. There are thousands of variations of this connector (round pin, square pin, male, female, pin spacing etc, etc), so you need the actual part number.
Since the ignition system on your motor uses a Mercury ignition coil, look at the used Mercury outboard ignition coil harnesses on the auction sites. You'll see they are much more reasonably priced.