Users have reported that the speedometer feature in Google Maps on Android Auto has been disappearing unexpectedly, but this is believed to be a temporary bug. To restore the speedometer, users should set a destination in Google Maps and tap 'Start.' If the speedometer does not reappear, users should check if the feature is enabled in the Settings menu under 'Navigation' and the Speedometer toggle. The feature may not be available in all regions, and if it fails to display consistently, a complete reset of the Android Auto setup may be necessary. Google has acknowledged the issue and is investigating it, while also rolling out features like current speed and speed limits, which may lead to inconsistent availability.