Take the positives or negatives off both batteries for about 1/2hr... that should reset any saved settings internally... As for a hardware reset... hmmm. . I think theres a way to do a gauge test thru the odometer, but duno if that would affect the overhead... (I dont have a 24v, so I am ignorant of these quirks. . heh) If you dont want to remove your battery posts, check in the primary fuse box (next to drivers side battery) and remove that bolt, and take off battery feed for internals. .
good luck...
-j