having done it on gas engines and covering everything electrical or fuel related and still getting water in there, what should i consider watersealing if anything before a power wash of my dirty engine? thanks

 

The only issue I have had was the " water in fuel " lite would go no , so I would unplug for a day or two to dry out then all was well .
But when ever I do any poking around with any of the electrical connectors , I like to dab a little dielectric grease in all connectors , this is how an truck / car should be manufactured & maintained , so that they do not cause issues [ bad connections ] , as when washing engine .