Carl, I have a Sieg C1 with the M1 milling attachment, the original Chinese control board was junked by the previous owner when it blew and was changed for a British manufactured unit,
I don't have the data book to hand at present, it's out in the workshop and too dark and damned cold to go out there at the mo', but I'll dig it out tomorrow and let you have the details,
The original controls on the headstock are still in place and working, photo's of it are in my albums, would think this unit plus an on/off & speed control switch would do the job for you, think they were around £100 last time I looked.
John.