1Heat gas or charcoal grill. In shallow dish, mix butter, vinegar, pepper sauce and salt. Cut each potato lengthwise into 4 wedges; pat dry with paper towels. Dip potato wedges into butter mixture; reserve any remaining butter mixture.
2Place potatoes on grill rack over medium heat. Cover grill; cook 25 to 35 minutes, brushing occasionally with butter mixture and turning once or twice, until tender. Serve with dressing.