How to set the colors in the justgage based on different conditions?

Question

I have Power Level Sensor.I want to set different colors based on the different conditions.The conditions are:

if (var1>var2):
    enable green color
elif(var1<var3):
    enable red color
elif(var3<var1<var2):
    enable orange color

I wrote the code for that:

var g1 = new JustGage({

          id: "g1",
          value:0,
          min: 0,
          max: 50000,
          label: "SSTR",
          title: "Ant-1 SSTR",
          customSectors : [{"lo":var2,"hi":var1,"color":"#3aa914"},
                   {"lo":var1,"hi":var3,"color":"#FF0000"},
                   {"lo":var3,"hi":var2,"color":"#FFA500"}],
         levelColorsGradient: false
});

and calling justgage function for every millisecond.The var1,var2 and var3 are the global variables.

setInterval((function () {
    g1.refresh(var1);
    }), 1000);

Is this is the right approach? Can we pass more than one argument(like color,id) to justgage refresh function?

How can I set the different colors in the gustgage based on different conditions?