Check out my threads for my led's, I have them for pretty much any application.
If you're wanting to have some areas be one color and other areas of the cluster be another color, the only way to do that is to do a custom build using individual led's. This is NOT a DIY project. There's only a couple of us led guys (myself included) that would attempt such a project.
It involves countless hours of drilling holes in the gauge pods after many more hours of locating the placement of each individual led behind the gauge overlays, followed by even more hours of hand soldering each individual component. Hence, not a DIY project by any means. Also, be prepared to spend a good amount of money for such a conversion. The parts including the cluster, led's & resistors alone will likely run $100 if someone were to put in all the hours of work for FREE.
Now on the other hand, if you just want to swap from a green dash to a blue dash, that's something that good DIY'er can handle in a weekend.
The cluster needs to be removed from the truck first, then the front cover needs co come off, then the needles need to be removed (and later re-calibrated) to finally get to the gauge overlays. They need to be removed to wet sand the oem color filtering off the back to allow the new led color to shine through properly.
I think this is the 5,000th time I've typed this
The type of led used will greatly affect the overall look of your dash too. The cheap auto parts store type led's will give you a look similar to this:
That was one of my early tests with cheap led's. Notice the crazy hot & dim spots? The light output from the cheap led's isn't evenly distributed throughout the cluster.
Here's the same cluster using better quality "buggman led's":
Notice the more even light distribution?
The color looks a lot better in person, I'm a horrible photographer
Over the years, I've tried dozens of led's until I found the type I'm using & recommending now. They're pretty affordable & look much better than the old yellowish bulbs.
If you decide to keep the stock green color, my white led's will really change the look of a stock cluster: