Jeremy, welcome to the forum.
Left and right are speakers, rectangle left of steering wheel is CD players! Portrait shaped rectangle could have been some kind of depth gauge / fishfinder. Other circular cut out perhaps some kind of speedometer.
Best way forward would be to fabricate a new panel and mount whatever rev counter is compatible with your outboard. Match it with a speedometer (less important though).
Would be good to also have a way of displaying engine temperature, fuel level and low oil pressure warning.
Buy a cheap marine GPS unit for navigation and speed over ground and carry a portable VHF radio.
Thank you very much Pete! As a beginner at only 18 I usually get, lets say, less than useful replies from people, however you are not one of them. I take in everything that everyone says and find it very useful.
I was thinking the same, a fuel meter, engine temp, oil pressure etc would be very useful as well as the other things you mentioned.
Again, thanks a lot!