Re: instrument cluster
i can't see your entire instrument cluster going out at the same time( unless your boat has been hit by lightening or something like that)
It's more likely a fuse/breaker or grounding problem to the whole panel. Check your owners manual and see if you have a 20 amp fuse/breaker reset on your engine someplace, then check to see if you have a reset fuse up by your ignition, then check individual blade fuse.
I had to replace the 20 amp reset fuse to the entire panel to get mine working.
good luck