Hello!
I finally found the photos of a EZ40 installed in a Bf 109! There is also a drawing of the EZ40 and wartime photos of this gunsight. I sent them to Horst Beck who owns as far as is known the only EZ40 left today.
He uploaded the photos on swapey. Here is the link:
EZ40 Gyro Gunsight
Best regards
Roger Gaemperle