Thinking of Building a Small Shop Plasma cnc.

Hello I Am thinking of building a low budget plasma cnc for my garage. I have already built a nice wood cnc but i have a left over stepper motor and a left over 3 axis driver board.

I also own a old plasma cutter so I have the most expensive things.

What i am trying to figure out is how i could operate the plasma on and off switch on the handle with the board i have.

Plasma cutter: Thermal Arc Pak 5XR

3 axis driver board: TB6560

Computer: Windows XP Running Mach 3

I have also attached a link to show everything and a peak at my wood cnc. https://www.youtube.com/watch?v=ZT9waSaieQY

The information on my tb6560 was on a eBay website that is apparently not existent anymore.

I Am pretty NOOB at this stuff especially the electronics part so if someone could help me figure this part out i think id be good to start building 8)