If you haven't been on the website go there and look under faq
Gauges & Displays VesselView Mobile | Mercury Marine
I believe there is a phone number you can call and they will verify if it will work.
On your motor near the starter there should be a smartcraft plug with a yellow or purple dust cap on it
More than likely you have a purple dust cap which means you will need to purchase the yellow resistor cap as well or the unit will not work. I can look up the part number for that if needed, they are like $12. It doesn't come with the kit as they started just using the yellow cap on all the motors so it was already there.
I am 99% sure it will work on all 250 opti Jet drives based on the time they were built. the Jet drive serial numbers which start with OE are not listed on the list of compatible motors.
I have it and works awesome, will give any engine faults as well as all engine info.