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$scope.$watch("view.wdg['currentGauge']['text']", function() {
  if($scope.view.wdg['currentGauge']['text'] > 5) {
    $scope.view.wdg['currentGauge']['src'] = 'app/resources/Uploaded/current_red.png';
  }
  else if($scope.view.wdg['currentGauge']['text'] > 1) {
    $scope.view.wdg['currentGauge']['src'] = 'app/resources/Uploaded/current_green.png';
  }
  else{
    $scope.view.wdg['currentGauge']['src'] = 'app/resources/Uploaded/current_yellow.png';
  }
});