The instructions I have are for the Airco factory controll board "AHC-D/S" that fits in the hole in the front of an auto-pak, dip-pak, dip core or dip-stick. It is for controlling a Miget [20-E or 20-P] spool gun. It has a switch for SPOOL & REGULAR and a 3 amp fuse. Is this what You have?