code: public void setDecimals(final int DECIMALS) {
          if (null == decimals) {
              _decimals = Helper.clamp(0, MAX_NO_OF_DECIMALS, DECIMALS);
              updateFormatString();
              fireUpdateEvent(REDRAW_EVENT);
          } else {
              decimals.set(DECIMALS);
          }
      }
docs: Defines the number of decimals that will be used to format the
  value of the gauge. The number of decimals will be clamped to
  a value between 0-3.
  
  @param DECIMALS