In a skillet heat vegetable oil. Cook onion and garlic until tender. Add turkey; cook until heated through. Remove meat mixture from pan into bowl. Heat tortillas according to package directions. Divide turkey onto top half of tortillas; top with cheese and salsa. Fold tortilla in half over filling. Melt margarine or butter in skillet. Grill taco on each side for 2-3 minutes or until cheese melts.