Ok, I am not satisfied with the results as after spent 5 hours in the car I managed to fix only temperature display
Here is my mini tutorual of what I did:
Before doing anything, read this post at least twice !!!
Also see this DIY, it helped me a lot !
http://www.benzworld.org/forums/w208-clk-class/1374260-diy-instrument-cluster-lcd-display-fix.html
Now, prepare the tool. Dont forget tweezers, scissors, screwdriver..
Very important: YOU DO NOT HAVE TO DISCONNECT THE BATTERY OR TO REMOVE YOUR WHEEL !!!!!! Also, you do not have to have handle to pull out (adjust) the wheel.
I did all this by not leaving the car. I did not push my key in ignition !
1. First, removing the cluster.. It is not so hard, what you need is a little strenght and 2 credit cards. No extra tool is needed, nor the hookes ! Just push the credit cards on the sides where you should push the hooks (see other tutorials) and use your strenght to push one side use your palms and fingers to cover more plastic as you can..), then the other.. Another person helped me on this by pushing other side in the same time.. So you may need an extra pair of hands.
2. Now the cluster is out and it is between its hole and steering wheel. Now, pull the cluster as much as you can and disconnect the cables. The cables are too short and they must be disconnected. The cable has a safety switch, and DO NOT TRY TO RIP ! Look few posts abovem they have a switch - a piece of black plastic which holds grey safety. Push the switch with your finger and grey part will rotate itself. Now you can just gently remove the cable without any resistance ! Now using both hands on wheel, hold cluster and wheel, and rotate them both to the right. See the link from the post above if you have any questions.
3. The instrument cluster is in your hands. Now, remove the plastic. There are few plastic switches on top and bottom side that holds plastic together, and you can unlock them easy. Now you removed the front "glass" (plastic) and you have the real cluster and bottom black plastic. It has 6 plastic switches (if I remmeber good) and do not forget the one at the bottom ! (I ll get back to this later)
4. You disconnected front and rear plastic and you have cluster in your hands. DO NOT TOUCH OR REMOVE THE NEEDLES, at least I didnt ! Turn it on the other side to reach the flat cable for temperature and clock. What I did is I used the paper, twisted it a few times like a cigar, then press it. In my case I made it tick more like x1,5 of the business card tickness. I tried this with less and more tickness but clock in my case didnt work in any case, and temerature sometimes did and sometimes not. So you would have to try few times if you are not lucky as I am not
When you insert paper (or whatever you think it is better) put the cluster in the rear plastic casing. Double check if all safety switches are ok ! Also check if all circless (fuel, speed and engine) are in same level ! In my case, before I figured this out, I forgot to attach one safety switch at the bottom, the transparent one which hold the fuel circle and then the needle didnt work !!!! They were hard to move, also check this !!! Try moving them in direction where they shoud move, and if everything is ok, they must move with ease. Now, do not put the front plastic ! just put the cluster back , the same way you pulled it out, but now it is much easy as you dont have front plastic part.. Attach the cables. Hold the grey lever on the cable down, you will hear gentle "click", and the lever will look like in picture 419 of the picture few post above where I found cables. Then, just push the cables, grey lever from cable will go to the middle of connector, push it a little bit until it reaches behind the safety switch. Do the same with seccond cable.
Now, the cluster is attached to cables, put the key in ignition and put it in position 1,2.. So you will test if you succeded or not.. In my case, I didnt, so I pulled cluster again and deattach the plastic and tried again... But when you finish, put the front platic on top, and then return entire cluster back in place..
in my case, I didnt lose any settings (radio code or anything else), and I didnt got any errors.. Everything is working as before, just now I have temerature working but not the clock
If you have any questions, I am here