JavaScript D3 circular chart scale

I'm a d3 noob, so I need some help on creating a circular gauge chart. The chart should switch from red to yellow to green based on certain value.

The problem is that I want to display the text inside the chart as 0 to 100, but now it is 360 to 0. Is this possible?

Also how can I position the value at center point of my inner circle?

I change the value randomly with this code:

  var pi = Math.PI;
  var num = Math.random() * 360;
  var numPi = Math.floor(num - 360) * -(pi/180);

I've made a simple plunker to show my attempt: http://plnkr.co/edit/CREdBeHKxre2ISNqOD6N?p=preview

Answer:1

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