Here is a small fix for the fuel gauge. The fuel is now shown in gallons (instead of percent * 1.7) and the right display is connected to battery power (instead of always on).
INSTALLATION: Copy to community folder
\ozx-aircraft-goose-hd\SimObjects\Airplanes\OZx-aircraft-Goose-G21A\panel\Grumman_Goose_G21A
and overwrite original file.