My requirement is in that gauge chart we have to show different colors up to 5. for that i have created custom vf page, but in that i have to show only 2 different colors.
How to get different colors in gauge dashboard??

Here i'm pasted my vf page and class..

VF Page:
<apex:page controller="TestPageController">

<script>
    MyChart1.on('beforeconfig', function(config) {
        config.axes[0].margin=-10;
    });
</script>
<apex:chart height="250" width="450" animate="true" legend="true" data="{!data}" >
    <apex:axis type="Gauge" position="left" margin="-10"
       minimum="0" maximum="10000" steps="2000" />
    <apex:gaugeSeries dataField="score" highlight="true" tips="true" donut="60"
        colorSet="#FF0000,#FACC2E,#31B404,#8A084B">      
    </apex:gaugeSeries>   
</apex:chart>
</apex:page>

Controller :

public class TestPageController {  

    public TestPageController(){

    }

    public List<gaugeData> getData() {
        double NPS_score = 0;
        Account score = [Select Id, Name, Amount_1__c, Amount_2__c,AnnualRevenue  From Account Where id='001i000000cxxM4' LIMIT 1];
         Account score1 = [Select Id, Name,  Amount_1__c From Account LIMIT 1];
        List<gaugeData> data = new List<gaugeData>();
        data.add(new gaugeData('AMT1', score.Amount_1__c));
        data.add(new gaugeData('AMT1', score.Amount_2__c));
        data.add(new gaugeData('AMT1', score.AnnualRevenue));
        
        
      
        return data;
    }
    public class gaugeData {
        public String name { get; set; }
   
        public decimal score { get; set; }

        public gaugeData(String name, decimal npsScore) {
            this.name = name;
           this.score = npsScore;
          
        }
    }
}

o/p is:
please find the attached screenshot.