score:34

Accepted answer

You can use innerRadius on yAxis. 

plotOptions: {
        solidgauge: {
            innerRadius: '75%',
            dataLabels: {
                y: -45,
                borderWidth: 0,
                useHTML: true
            }
        }
 },

http://jsfiddle.net/jm8E4/6/

score:-1

Try below code

EDITED

i have changed innerradius and outerradius

       background: {
            backgroundColor: '#fff',
            innerRadius: '60%',
            outerRadius: '100%',
            shape: 'arc',
            borderColor: 'transparent'
        }

create chart with innerRadius same as outerRadius

outerRadius is the background radius on which chart will shown and innerRadius is chart radius.

Demo Edited Fiddle


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