Matjluk, The link I posted is for the engine. This would allow you to connect to the plug already in the boat. Not sure off the top of my head what the 10th pin was for, but you may just have to make an external connection for it if it is needed.

10th pin is for the alarm wire, the 9 pin harness had a seperate wire that went around the cannon plug. I'd change the boat harness so no matter what you put in for power from here on out you're good

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This is the motor plug , I guess I could call a distributor and ask them for advice . Anybody have a part number do they not make an adaptor plug ?

Rewiring the boat for 10 pin should be pretty simple guessing the wiring diagrams are correct right ? Or is this going to be a pain in the ass , my only concern is when I go to remove the old wiring I take something out I shouldn't , am I over thinking this ?

Yes you are. The wiring is very easy and can be done in a few hours.
Purple wire switched ignition
Yellow with red start
Lt blue oil press
Tan water temp
Gray tach
Black ground
Red power from breaker
Tan w blue alarm.
Brown w white trim sender
If you snake the new harness in and swap 1 wire at a time off the gauges and ign switch its not hard
Where in mass are you?

Your probably right . As soon as the weather breaks gonna tear into it , I'm out of town a lot so I need to make the most of weekends and have all the right parts ready . Thanks I'm sure I will have more questions , I'm in agawam

Ill find a part number for you and some pics

Awsome

This great I live in west side I am sure we will see you on the river, good to see another Formula out there.

Masi , I'm on the river a bit I keep a boat there being how its so close. I like old saybrook better but then you kinda need some other boats with you in case of breakdown , I think I read one of your posts about bolster seats being redone ? You ever do that and how did they come out ? I've had upholstery done in the past and seems like no one can do factory jobs no matter what you pay . I got 2 formulas I'm always taking engines out upgrading and rebuilding . Ever have any questions or need a tool just ask have just about everything . - Matt