I see the link to the kit above has a wiring diagram for the 3 PM round connector, I didn’t notice it said wiring diagram before. But I’m still curious about the oval three pin connector.
The center wire goes to a 12v power source that turns on with a key.
The front wire is a ground for the overdrive, only comes on when in 3rd gear. I have a toggle switch run from that wire to a ground and can flip it on when in third gear and it electronically goes into overdrive.
The rear wire is the ground for the lock up. I also run that to a separate toggle and rarely use it. I only flip it on when on the highway at 70 mph and not accelerating.
Personally I would not run them both to the same switch because I do not use the lock up often and find the car chugging a little bit when it is activated at lower speeds.