Andres Olson Dahl

I'm searching for my great grandparents in Norway. Here's what I have. Andres Olson Dahl, b. 1 Oct.1844 in Norway died 6 Aug. 1883 Dane county Wisconsin He had a Brother John O. Dahl, also in Dane county in 1883 His will used the name Andrew, his headstone Andres Mathilda Anderson Dahl born 28 Dec. 1847 in Norway died 21 Nov. 1910 in Columbia county Wi. possibly immigrated 1854 They had 4 children, all born in Wi Anna S. b. 1877 Olaus A. b. 1879 Christian T. b 1881 Levi A. b. 1883 I can't find them anywhere before 1883. Any help would be greatly appreciated Jim