There is an online 1880 census for Norwegians living in Wisconsin, is this the family?http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbas...
52782 Nelson Ludvigsen m 35 f Den Den Den 93 Franklin Manitowoc
52783 Ann Ludvigsen f 27 W N N 93 Franklin Manitowoc
52784 Martin Ludvigsen m 2 W Den W 93 Franklin Manitowoc
If that was your Ann is shows her born in Wisconsin, so her parents came over. If it is her, she was born about 1853 - early in the emigration. You didn't give a birthdate for her, that would help to know which records to search.
The Witnesses to the wedding may also be on the census for 1880 in Wisc.
You can also check it out online herehttp://www.familysearch.org/Eng/Search/frameset_search.asp?P...
Here is an Ole Gakkestad and familyhttp://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbas...
54702 Ole Gakkestad m 54 f N N N 244 Manitowoc Rapid Manitowoc
54703 Bergit Gakkestad f 50 N N N 244 Manitowoc Rapid Manitowoc
54704 Theodore Gakkestad m 16 lab W N N 244 Manitowoc Rapid Manitowoc
54705 Bertha Gakkastad f 12 W N N 244 Manitowoc Rapid Manitowoc
I did find Gakkestad farm on the 1865 census for Bygland municipality in Aust-Agder fylke. An excellent Aust-Augder researcher is Derek. Perhaps by posting this query for Gakkestad at the Aust Agder query page you can get some help there.http://boards.ancestry.com/mbexec?htx=board&r=rw&p=l...
There are possibly answers that can be found at the Manitowoc Wisc. website or county historical society ???
Good luck with your search,