Thanks for the info. But I haven't connected the signal ground to anything. For a different reason (in order not to connect the X and Y amp ground together) but right now it's not connected...
There's still the ripple thing you mentioned and the graphic is skewed (probably more than just skewed).
One more thing maybe worth metnioning is since they forgot to ship the signal cables I had to make my own and used a cat5 cable an the length of the signal cable inside the projector is 40 cm (from back of the case where the ILDA connector is to the scanner Amps on the second floor of the case)