Make Pesto: In a blender or food processor combine olive oil, cheese, arugula, pine nuts, lemon juice, garlic, salt and pepper. Process until well combined.
Cook pasta according to package directions, reserving ¾ cup of cooking liquid.
Meanwhile, heat a large skillet to medium high heat. Spray pan well. Add sausage and cook until browned, about 6 minutes. Remove from pan and drain on paper towels.
Re-spray pan if necessary. Add 1 teaspoon garlic and cook for 1 minute. Add reserved pasta cooking liquid to the pan and bring to a boil. Add 2 tablespoons olive oil and whisk to combine. Add pasta to the pan and toss to combine. Stir in pesto until well combined.
Top with additional parmesan cheese and pine nuts. Serve warm.