Do you have the machine torch and does your PM65 already have a CPC port?
If yes, you need the CPC cable and hook it up using the Langmuir instructions and the pinout information in your Hypertherm manual.
If not, you’ll have to open up the PM case and do some direct wiring to defeat the hand torch safety. There are a couple of threads on the forum that cover the 45xp, which is basically the same procedure.