You can use the Forney TIG torch or any 17V style torch with a size 25 dinse style connector. The MP machines do not have a gas solenoid for TIG welding so a TIG torch with gas valve is necessary. The “V” in 17V indicates the torch has a gas valve.
The Forney TIG torch has a trigger that connects to a 7 pin Amphenol style connector that allows you activate the arc with the trigger. A traditional non-trigger torch can also be used with a lift-arc technique. The output is DC only and suitable for welding various steels, and some stainless steel.
The Forney MP machines are not A/C, pulse, or high frequency capable so welding aluminum is not recommended.