code: private List<GaugeZoneAO> createDefaultZones(){
  		ArrayList<GaugeZoneAO> ret = new ArrayList<>(1);
  		GaugeZoneAO redZone = new GaugeZoneAO();
  		redZone.setColor("red");
  		redZone.setLeft(0.9f);
  		redZone.setRight(1.0f);
  		ret.add(redZone);
  		return ret;
  	}
docs: This method creates some default zones if nothing is configured.
  @return