In a large resealable plastic bag, combine first five ingredients; add chicken and sausage. Seal bag and turn to coat; refrigerate 1 hour.
Meanwhile, place potatoes in a large microwave-safe bowl. Cover and microwave on high 6-8 minutes or until almost tender, stirring twice.
Drain and discard marinade. On metal or soaked wooden skewers, alternately thread chicken, potatoes, sausage and pineapple. Grill, covered, over medium heat 10-15 minutes or until chicken juices run clear, turning frequently. Serve with ranch dressing. Yield: 8 servings.