Interesting project. I can’t help with the connection to your on-board display but I could offer a few thoughts.
It might be worth a trial run with a GoPro or some other brand of waterproof sports camera (perhaps borrow one) to determine what view your likely to achieve. The motion of the boat might require a gimbal or some type of image stabilization or you might get a bit nauseous from watching for any length of time.
I did a quick Google and found this camera. I have no idea if it really does what it claims but the videos are compelling.
Low-light performance of cameras has been important for decades, but the action cameras like GoPro have always struggled due to size limitations. Tech brand SiOnyx's new camera has utterly obliterated the competition in this area. The SiOnyx Aurora action camera has ridiculous low-light...
fstoppers.com
A forum participant who has quite a bit of on-board camera posts is
@Bill19233 who might be able to provide some insight.