Gentlemen, It's the never ending story of us asking questions and not giving enough info, so you guys have to guess. Sorry but it's only to avoid long threads.
As to where I am, Pls see:
@PaulRB Cogs were my first choice. All the shafts go through the frame.
I have some problems. My gears were not CNC'd but 3D printed and are not fine like the original one, so they have a little "play". The white parts of the gears were printed separately, as a half circle, and I had to glue them to the black gears, thus loosing some precision. After a lot of trials and throwing away gears and frames (life is hard for rookies) I found out that the gears can not be aligned in a strait line in order to turn. They kept getting stuck.
My panel works, i.e. it turns , but as you can see in the video is not precise.
So, I thought why all the trouble ? I'll just 3D print the white half circle ( the back ground is black anyway) stick them to a motor, and turn them. Then make a full disc in the back of each to place a magnet for the sensor.
Hope you have the whole picture now. Thank you all