One thing, The A/C controls I only put one LED in the top part of each bulb replacement. So the way it looks is not the way it should look with 2 LEDs per bulb slot. When I do the rest of my interior in blue LED ill change those out and show you the new pics....now with that said...here we go....
1) Take out the A/C controls by first removing the dash part (you will have to put the gear shifter in first to be able to remove it.
2) There's 2 screws (I forget the size) to remove and then 4 clips to undo, then the A/C box comes out.
3)Pull out the knobs on the front side, then take out the 2 screws(forget what size) holding the box that controls the fan speed on the back.
4)On the back of the box, unscrew the 4 screws and the box comes apart (go easy on it, it WILL come apart...patience my friends)
5)Ok, bear with me as I try to explain this part....
On the back of the A/C controls, that circuit board pulls out, you have to push the clips that hold it in and GENTLY nudge it out. It's tedious work, just do it little by little. Next you will see 4 bulbs on the front(white) side of the board, on the back side (green), unsolder those bulbs. BEFORE doing this, if you dont have a voltmeter, I strongly suggest getting one ($6 at any electronics store) so you can get the "+" and "-" of each of the bulb sockets. Make a mental note or mark it, it will save you ALOT of time because these 4 bulbs are connected in a series(which brings up a question I will ask at the end of this write up) and must be soldered in correctly or else none will light up.
On the other smaller circuit board, that part has 3 bulbs (at least on mine) that you can switch just like the 4 I mentioned above. Like I said, get a voltmeter and get the "+" and "-" sides to save time.
First you have to remove 2 small screws, and that little skinny board comes off.
One thing about the bulbs on the smaller board, make the distance from the top of the LED to the leads that you solder to the board very short, because the space in there is very small, I couldn't fit my LEDs with resistors in at first, so I had to go back and try to make em as short as possible.
And there you have it! Good Luck! 
'01 Sierra 4.8 SCSB
4.10, Eaton posi, Nelson tune, 160 t-stat, K&N Intake, Magnaflow catback, Vig 3200, Transgo+billets, 100 NX wet shot
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.i'm sure you could come up with something.. might have to get some new ends and tie them into the existing and mout them to the back of the bezel if possible. I dont have any experience with the newer dashes.
) so it can handle the voltage...
