Hi everybody. Today I have finished the retrofit of a Comand NTG-2 and a Black Series Cluster to my A209 CLK200K. The retrofit of the NTG-2 was very easy just the mods in the wires to quadlock connector in order to match the pinout with the old wiring harness with two ISO connectors in order not to cut anything. Also a new plastic cell to fit the ntg2 and a new Gps antena The digital thermotronic was just plug & play. The upper section with the switches has some work to do but with the pinout layout of the wires it can been done. I will not write many details, because there are many threads about it. The only thing I couldn't make work is to enable the video input in order the signal from the backup camera to be seen on the screen when I press the video button. If anyone knows how it can be done, his help will be great.
The black series cluster retrofit was also easy. First I match the khm from the old cluster to the new and after I connect it to the car a friend of mine make the coding. The fuel gauge works just fine after we select the right tank. The only problem I have is that the needle of the tacho is reading more speed khm and the digital tacho less. Only the cruise control reads the correct speed. For examble when the real speed is 100khm/h, the tacho reads 110khm/h and the digital reads 55khm/h, just the half.
All the other readings are working fine from the oil temp to lap timer and the oil level sensor.
Please if anyone have any idea who to fix that problems it will be very helpfull.
The interior of the car has change and is very nice.

if I could know what parts you used to make it connect NTG2 ? Do you have BOSE in your car ?

First you need the head unit and the plastic cell which will hold the ntg2 in place. The cell must be from w209 and not from w203. For the upper switch block you will buy a facelift block with the same switch that the old one has. Also the upper switch block must have on it the connectors with cutten wires because they are different. MB doesn't give them as spare part. The AC control unit is easy. You can buy the analog or the digital one if you have thermotronic. All this you can find in a store with used MB parts. Also the ntg2 must have the quadlock connector on at the back. The gps antenna has different fakra connector. You can buy a new one or you can find an adapter. If you find all of them in one store you will save money because you can bargain the price. I pay for all 500€.
My car hasn't bose amp but I but the bose amp from W208 who has not optical fabric and it is very powerfull. The only thing that you have to do is to find one with the connector on it with some cm of wire, drive 8 wires from the ntg2 speaker output to the bose input at the trank and 8 more wires from the amp output to the back of the command which will be connected to the connector of the OEM speakers. Also you will need one more wire for the remote power of the amp which will be taken from the 12V switched antenna pin. The power for the amp will be taken from the back sam. It has 40amp fuse. All this must be done if you have not bose amp. If you have it is more easy because you will use the existing bose wiring harness. All this info I have taken from threads in this forum. The only thing you have to do is some search and you will find everything you want. If you need some info you can pm me.