Do you have a means of accurately synchronizing the engines?
As for what AP, I really wouldn't now what is right for you and your style of cruising or level of features you need. Personally, I lean to the ComNav line of APs, but that opinion is worth about what you paid for it. Garmin, Simrad, Raymarine, Furuno all make nice units, and I have used and/or owned examples of each.
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George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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