Wine Woman. That machine is like the White that I purchased, only mine was on a treadle cabinet. So you can use it either way, electric or PP. The way mine is set up, the extra round outlet on the back is for the light. On the underneath side there was a plug in that you plugged the line from the underside of the motor plug in. It had a standard extension cord from that to bring the electricity to the machine.
It is the first time that I have seen a "pull" reostate for the control from the knee lever as you show on your cabinet. Mine is the same. I think they had to put it on the left side due to the treadle belt on the right.
Boy that is not very clear. I will try and take some pictures tonight of the underside wiring. I plan on treadling mine.