Cook sausage in a large skillet over medium heat for 5-6 minutes or until thoroughly heated, stirring frequently. Remove pork from sausage casings and cut or crumble into small pieces. Add flour, sausage and gradually adding milk while stirring. Cook until the mixture comes to a boil and thickens, stirring constantly. Reduce heat to medium-low; simmer 2 minutes, stirring constantly. Season to taste with salt and pepper.