You can set a background color for gauge charts within :
...
scaleR:{
...
guide:{
lineWidth: 2,
lineColor:'#ff0000', //red lines
items:[
{
backgroundColor:"#ccc
}
]
}
}
Demo
The demo above sets a backgroundColor for the sections between the red lines. If you need to create multiple colors this also can be done.
...
scaleR:{
ring:{
backgroundColor:'#ED792F' //set orange ring
},
guide:{
lineWidth: 2,
lineColor:'#ff0000', //red lines
items:[
{
backgroundColor:'#ccc' //grey background
},
{
backgroundColor:'#aaa' //light grey background
}
]
}