I know it’s all been said before but this whole issue makes no since at all to me. The gear indicator going - - especially. Gear position isn’t calculated. It’s a physical switch. As long as the bike is powered up it knows the gear position no matter what. Even on ABS models the only thing really needed is wheel speed and there’s two sensors for that. And ABS also works no matter what gear your in, even neutral, at any speed over about 5 mph or so. What any of this has to do with final drive gear ratios is beyond me.