Here is an opening in the fuselage frame no. 8 in front of the cockpit to allow for the cabling from the throttle quadrant to pass through. The black cables are electrical, while the brass-coloured pipes belong to the pneumatic system
The most prominent control at the port side of the cockpit is the throttle and propeller control quadrant. The largest lever with the yellow handle is the throttle/mixture control. The lever to the right controls the propeller pitch.