score:2

Accepted answer

You should add dataLabels.formatter to the series part of your gauge to remove it.

dataLabels: {
    formatter: function () {
        return null;
    }
},

Live example: jsFiddle

score:3

or you can achieve the result you want just by adding the following lines:

series: [{
    dataLabels: {
         enabled: false
    }
}]

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