Tooltip does not work with gauge chart; using the latest version - Ext JS 6.0.1 (classic).
Here is my tooltip configuration:
tooltip: {
trackMouse: true,
width: 140,
height: 28,
renderer: function(toolTip, record, ctx) {
toolTip.setHtml(record.get('data1') + '%');
}
}
You can reach the fiddle from here.