Marinizing a VW Passat engine

Hello everyone.

I have a somewhat unusual request. I'm currently in the process of marinizing a Passat PD engine, model year 2000 (ATJ), to install it in a motorboat. Now, I need a lot of expert knowledge about the processes within the engine control unit (ECU). My first question is: can the instrument panel be omitted? I've already had the warning and fault codes cleared. It would also be important to know what factors can cause the ECU to enter a "limp home" or emergency mode. What happens when the error memory is constantly filled with things like ABS or airbag errors?

Hopefully, you have some good information for me.
Thank you in advance.

Martin.