I\'ve not found an API or previous question that addresses changing the width of the solid gauge data plot.
I can easily change the chart width, plot width, plot pad
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