Dried and cracked a little on the key switch side. This is the wire harness that goes from the engine to the dash panel instrument cluster. You will get the vintage Mercury motor to dash wire harness as seen in the pictures.
If your plug looks like the one in the pictures this might work for you. The item "Vintage Mercury Outboard 15 ft Engine to Dash Key Switch Wire Harness 7 Pin Plug" is in sale since Tuesday, October 03, 2017. This item is in the category "eBay Motors\Parts & Accessories\Boat Parts\Outboard Engines & Components\Electrical Systems". The seller is "outboardheaven" and is located in Suamico, Wisconsin. This item can be shipped worldwide.