John and Johanna Johnson immigration to Compton, MN or Carver Country, MN from Skovde, Skaraborg, Sweden

I have a good portion of my family tree completed, but the fun part of doing a tree is to continue to find missing links.  Someone immigrated from Sweden first before my great-great grandparents (both Johnson) immigrated to the U.S.   I believe it was Anders Gustaf Johannson (Johnson), born 26 Feb. 1844 in Kvinnestad Parish, Sweden.  He immigrated in 1868 to Carver County.  I would love to find this missing link.