From looking at the PDF, it seems that the YUV connection is on the 9pin D connector. Not sure where you'd get a lead for that - though possibly from Hantarex themselves.
Poking around the Hantarex website shows a number of monitors that start CT, not all of them are YUV enabled. I would recommend you confirm the model number to check it is one that supports YUV.
For instance, this one doesn't.
http://www.hantarex.com/pdf/CTEQ3.pdf