Al,
As Stephen has said the SC-28 lead is the current item. I have SC-17 which it replaced and you might be able to find a second hand one of those.
I will see if I can find a downloadable manual for the SB-22 from the Nikon site then I can see your options.
I only ever use manual flash as that way I can control the light output by either turning the power up or down, or moving it nearer to or further away from the subject which has the same effect, but I know Foxy has used ITTL very successfully.
If the piston is your subject I will see if I can find something similar to have a go at, so I can do more behind the scenes shots. Do not worry that you are struggling a bit at this stage. I did too, but at least you do not need to buy shares in polaroid as you are on digital.
Don