First create a DSN within IM (Objects > DSN). Enter a name and select the sql driver. Click on Connection string and edit and paste this:
Provider=MSDASQL.1;Connect Timeout=15;Extended Properties="DRIVER=SQL Server;SERVER=MyServer;UID=UserID;PWD=Password;APP=Integration Manager;DATABASE=MyDB";WSID=NTWKSTN1; Locale Identifier=1033;Database=MyDB
Now create a new Integration, source choose Adv ODBC and define new. Choose the DSN created above. Enter Exec SPName in the query.
I can see my columns, but I'm having issues previewing my data, but it could just be the sp I picked to test.