Are you kidding me?

/**
 * Implements hook_menu_alter().
 */
function dashboard_menu_alter(&$items) {
  // Make the dashboard the default local task on /admin.
  $items['admin']['title'] = 'Dashboard';
  $items['admin']['page callback'] = 'dashboard_admin';
  $items['admin']['access arguments'] = array('access dashboard');
  $items['admin/dashboard']['type'] = MENU_DEFAULT_LOCAL_TASK;
  $items['admin/by-task']['type'] = MENU_LOCAL_TASK;
}

  $items['admin']['access arguments'] = array('access dashboard');

No way.