Converting a THCAD-300 to a THCAD-10?

The thcad2 replaces both the thcad 10 and thcad 5. The manual will tell you how to configure it. Go for a 200 volt range and you will be sweet for the 45XP

Personally, I would buy the cpc interface. There is a trick you can do with a short piece of fine wire inserted into the torch connector to permit CNC firing of the machine torch Search for it.

And will go with two THCAD-2 as ohmic sensor looks like very good approach. For the moment i'll stick to the hand held Duramax torch i have. 

THCAD-2 two pieces just ordered. Regarding CPC port: are we talking about Hypertherm Part Number ‎428653?