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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
There is an adapter harness that converts the digital to analog. It'll allow most variations to be connected from the new engine harness to the old boat harness, same for the controls if needed. The parts supplier that supplied you with the new engine should have suggested these parts based on the vessel the engine is being installed on.
Thank you!- Joe
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But as a side note, I myself would prefer to run the smartcraft gauges esp for the check engine light, they provide much more than your old analog gauges are going to for you.
It requires an adapter.
What I mean is the adapter is usually plug and play, the ones that are not come with instructions.