Preheat oven to 350°F. Stuff each pita wedge with 1 sausage slice and 2 teaspoons cheese. Place on ungreased baking sheet. Brush tops of wedges lightly with oil.
Bake 5 minutes, or until cheese is melted and sausage is heated through.
Meanwhile, mix yogurt, mayonnaise, cucumbers, onions, salt and pepper in small bowl until well blended. Serve as a dip with the stuffed pita wedges.