There are a lot of posts regarding Sherman 200 some with pin outs about 300 pages all told I think hope someone book marked one or try the search for foot pedal, jasic, sherman.
As a follow up to this, the pedal I received (from the ebay link) didn’t have a pot to adjust top amps, so the pedal range was 5-190 amps, I asked grey eagles about this and was told that was all I was getting but could have a refund, which is fair I suppose, working with a very bright electronics guy at my job, he went through it with me and I retro fitted a multi turn 20ohm pot , which gave me adjustable settings at the pedal (winner), top range is 165 amps with pedal plugged in, my mate said I could go further and get better top amps but ,it works fine for my needs so I left it at that. I’m now happily welding thin alloy parts and happy . Ps my machine is mk3