2004 to 2006 Gauges
The LED's surround the needles of the 2004 to 2006 gauges, the gauge and needle have to be the same color, I can switch the (LCD) mileage to white or another color.
The 2004 through 2006 gauges will never appear as bright as the 2007 and up gauges due to their design of all the LED's surrounding the needle and radiating the light out to the numbers.
Blue seems to lose it's color more than Red, Green and white. and can appear somewhat purple/ultra violet in black faced gauges.
Silver faceplate gauges will appear brighter than the blk faceplate gauges.