The PP cable can be found here
The plug on the bottom of Kelings wiring diagram is just a DB9 plug with all the G540's inputs and outputs in one plug.
You do not have to wire it this way, I used a DB9 for the 4 inputs and a seperate one for the VFD hookups.
Here is another diagram for you to look over http://www.homanndesigns.com/pdfs/EN010_V8.pdf
Did you get your current set resistors? for the drive end of the motor plugs