Pretty sure that may be a Miller 14 pin connection.
Check out ssc foot controls - they work really good and they have a chart that lists all the models.
If it's not on the list, contact them and they will hook you up.
Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~
Airco 300 - Syncro 350
Thermal Arc 161 and 300
Tried being normal once, didn't take....I think it was a Tuesday.