[mikkowl]

Now I understand how the prop pitch work!!
I had it working but I haven't undestand it before your reply!!!

Fuel mix, radiator and magneto work the same way. Be careful. If you set fuel mix or magneto to 0% on one engine, then you do anything on the other (like move the throttle, or just select the engine) it will set fuel mix / magneto to 0 on that engine too, and it will stop.

This is why it is so difficult to have individual prop pitch, fuel mix etc in multi-throttle. I tried but it did not work properly.