There's been a lot of interest lately concerning the LED dash upgrade and unfortunately a lot of misinformation to go along with it. I can't speak for the older style dash for the YJ but this build is for a 95 YJ.
This upgrade is a very simple very cheap mod that anyone with a screwdriver and needle-nose pliers can do.
This is what you will need:
7 x Type 194 (168 2825 T10 5-SMD) LED Car light bulbs
1 x Screwdriver
1 x Needle-nose pliers
The cheapest I have found are these (which I used), $10 USD shipped:
Buy them here:
Jtech 10x 194 168 2825 T10 5-SMD Green LED Car Lights Bulb : Amazon.com : Automotive
Those are green but you can get them in almost any color you want in the same price range (search at the bottom of the page for similar items)
So this is where you start from (my lights are on right now, make sure that when you start pulling stuff apart you turn your lights off)
NOTE: If you choose you can disconnect the neutral on your battery to ensure you avoid damaging any electrical components. I did not do that, but it is certainly an option.
First remove the dash by unscrewing the red screws first then the blue in this picture:
Then move on to the instrument cluster to your right, there are 6 screws which are circled in red:
I made a mistake in the next picture and circled the wrong screws, disregard the red circles and unscrew the blue ones only:
Once the clear plastic cover is removed then proceed to remove the black shroud plus the 4x4 insert.
WARNING: Take care not to damage the 4x4 insert as it will probably fall away from the black shroud when it is removed, it is not attached
WARNING: Ensure you do not touch the instrument dials when they are exposed, it is possible to damage the sensitive components. This mod will not require any modification or removal of the needles or the black backing of the dial
NOTE: Anytime you pull the bulbs, ensure you use light pressure with the pliers as not to damage the components
In the next blurry picture there are three bulbs that need to be replaced, they can be pulled from their housing and do not require any "reaching around the back" to pull them. After they are pulled with the needle-nose pliers, replace them with the LED lights.
The sockets themselves can be removed (don't remove them for the instrument cluster, but you will have to pull 3 of them for the speedo and tach but that's later) but this picture shows how they seat in comparison with the stock lights:
Now once all the cluster lights are replaced, move to your speedo and tach. Go ahead and unscrew all the black screws attached to the white plastic and unclip the plastic clip. Unscrew only the plastic shroud for the speedo NOT the tach
I removed the plastic guard for the tachometer in error, you do not have to do that
There are also screws on the bottom that will need to be removed for ease of access:
Once the plastic cover for the speedo is removed this is what you should see
WARNING: Same rules apply for the needle as before
Go ahead and pull the light bulb and replace
Now this is the only part that will require some actual reaching and maybe some extra work on your part. CAREFULLY move the which plastic housing the speedo and tach about two inches towards the interior of the Jeep, that is two inches towards you if you sitting in the jeep.
You are going to have to reach behind the white plastic and find the two bulbs in the tachometer and the last remaining bulb in the speedometer
NOTE: The bulbs are housed in grey plastic sockets that can be turned counter-clockwise to be released. There is no need to remove any wiring at all.
Remember this is what they look like:
Turn them counter-clockwise to release them from behind the speedo and tach and replace them.
In theory you should have 7 light bulbs sitting next to you and 7 LEDs installed. Now it is time to test them.
Turn on your lights and you should see something like this:
If not simply turn the LED around in its socket and they should light up (they may not turn on since they are... can't think of the word... but they only go in one way)