Electrical nightmare

Helllo again. This time, Im at a complete loss. I've spent hours trying to find out why my tempgauge, fuel gauge, shift display, & radio stopped working. Also the charge light is still on, even though it's charging. (The shift display quit about a week before the other stuff did.) I've checked ground points, avd all fuses great and small with an ohmmeter, and pored over diagrams searching for a common point that would tie all this together. I'm considering calling the Belle of Louisville, to see if they need a new boat anchor! Help, pls!!