engine panel

I am the new owner of a 1980 Hunter Cherubini 30 ft with a fairly new Yanmar engine. Unfortunately the engine control panel is not as new and being and engineer, I'd like to know a little bit more about my engine while it is running. Has anyone here had experience with swapping out an old panel...

I had the suspicion that my Catalina 30 (87) engine panel was wired by a maniac, and the repairs for the lightning strike gives me a change to really get my head into that. I have new buzzers and warning lights, new bulbs etc and made sense of most of the wiring. But this thing still puzzles me...