DTS was an option for my year. Will have a look at the connector. I would do this install myself. How involved would it be if I did in fact have the bigger connector?
Below is a file on the 10 pin setup. The first part is an overview of a Mercruiser setup showing the parts on the engine you would need along with the basic parts up to the control
The last page of the file is just a wiring diagram from where the control plugs into the engine. Could be outboard or IO, or inboard, that part is the same. The engine parts are what is different.