In the dashboard config file, you must add this configuration in the tiles key. The ids should contain the ids of the velo stations that you want to display on the dashboard.
In app\Console\Kernel.php you should schedule the Spatie\VeloTile\FetchVeloStationsCommand to run. You can let in run every minute if you want. You could also run is less frequently if you fast updates on the dashboard aren't that important for this tile.
// in app/console/Kernel.phpprotectedfunctionschedule(Schedule $schedule)
{
// ...$schedule->command(Spatie\VeloTile\FetchVeloStationsCommand::class)->everyMinute();
}