Looking for something that you can plug into both motors with twin engines, and plug laptop in for diag without having to switch back and forth underway. I thought I had stumbled across one last week latop died with webpage open before i could check it out :/

Found this but it doesnt look the same and not certain what it does, its not a diag port y cable with a A/B switch like I was expecting to find

http://www.ebay.com/itm/OEM-MERCURY-...-/171666306760