I have a 1984 ODay 28. I’m installing Raymarine chart-plotter, auto helm and in-the-hull transducer for depth readings. She currently has 2 gauges that do not function installed in the cabin side facing the cockpit. One is a depth meter and the other is a know meter.
I’m planning on removing them and considering options to fill the void. One idea is cut out the holes into a rectangle and install a portal – either an opening one or just a window. Another idea is to fiberglass and gel coat over the area. A third is to put some sort of finished white paint coated circular plates or inspection ports. See the photos and let me know you thoughts. My wife’s idea is to install a little shelf inside the cabin where the backside of these instruments are now, maybe a spice rack or something like that.