Add sausage and crushed red pepper
Cook until sausage is no longer pink, stirring frequently, about 7 minutes.
Add onion and garlic to skillet and cook until onion is tender and sausage is light brown, stirring occasionally, about 7 minutes
Add tomatoes, cream, and salt.
Simmer until mixture thickens slightly, about 4 minutes.
Cook pasta in large pot of boiling water, Drain
Bring sauce to a simmer