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Its not a type of connection one would normally ascociate with waterproof use, but in the context of an ECU that just needs to be splash proof I think you'll be ok with any of the plastic moulded ones as once screwed down they are pretty good, and you could always just run a thin film of silicon sealant around it.
TF electrical spray or something similar. any electrical contact spray with silicone in will do the job. heat shrink tho is a better idea. will only take a knife if needs be to get at whats inside!
For splash proof heat shrink or as said above a spray.
If they fit your needs ( maybe overkill) try dow Corning for a silicone grease or subcon for a waterproof connector. We use them on the auv (1600m deep) for data and power
I haven't come across a ready made waterproof RS232 cable that uses D-type connectors before. They usually use AB or Litern type connectors if a high IP rating is required.