Very easy if you know how to soder and have LEDS. When you take the gauges out. Take out bulbs that are behind the needles in the back. You should see clear plastic blockish thing. Soder leds to correct positive and negative metal spots and aim leds to light up clear plastic block. The plastic block send the light to the needles. I did mine and they turned out great but i have gauge overlays. So yours might turn out different.
Hope this helps, if not let me know.
MAtt