Lightly brown sausage in large skillet over medium heat, about 4 to 5 minutes. Remove sausage and set aside. Add margarine, zucchini and onion to skillet and cook until zucchini is crisp-tender. Return sausage to skillet and add garlic salt, oregano and pepper and stir to mix. Add tomatoes and continue heating until hot. Serve sausage-zucchini mixture over pasta or rice.