Sorry I can't give you any pics Andrew, but what problems are you having with the wiring? My issue will be with the angle and offset of the pedal, not the wiring plug.
My fly by wire pedal is at home ready to go. It's going in next to a manual XF Falcon pedal box which is in the car but the pedal levers need straightening and I'm not going to mount the accelerator until that's done. Before that can be done I need to finalise the steering column and seat position (with thanks to M. Govert)
Re pedal "vagueness" I heard that this can be calibrated in the engine management software. Maybe GM incorporate a slight pedal delay to smooth out driveline forces and road manners - does anyone know? Plums?