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The three contacts on the bottom of the PB6 are probably the throttle switch. One of the contacts will be the common (probably center), one will be normally closed, and the other will be normally open.
In an AC motor system, the throttle pot can actuate regen as well. Before you use a two-wire setup, (instead of the full yellow/black/purple on the diagram) you may want to research if your system has regen, and how it is actuated.
The wiring diagram you have shows the 'control' portion of the controller.
The portion not shown is the HV wiring. The AC motor usually has three large cables that go to the controller, and the controller has two cables that go to + and - on your HV pack. Some controllers have a 3-cable system from the main pack. In this case, the B- goes to pack -, the B+ goes to pack +, and the high-amperage fuse goes between F+ and B+.
Your main contactor can be used to turn on power to the + or - cable from the pack, but sometimes the main contactor is omitted.
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