Heat gas or charcoal grill. In resealable food-storage plastic bag, mix oil, lime juice and grill seasoning. Add chicken; seal bag and turn to coat. Refrigerate 10 minutes, turning once.
Meanwhile, in small bowl, mix salsa, mango, cilantro and pepper sauce. Cover; refrigerate until serving time.
Remove chicken from marinade, discarding marinade. Place chicken on grill over medium heat. Cover grill; cook 12 minutes, turning once, until no longer pink in center. Serve chicken in tortillas with mango salsa. Sprinkle with cheese and lettuce.