The BSE benchmark Sensex gained over 84 points in early trade today.The 30-share barometer, which had lost 235 points in the last two trading sessions, recovered by 84.29 points, or 0.53 per cent, to 16,032.39.The wide-based National Stock Exchange index Nifty also moved up by 18.95 points, or 0.39 per cent, to 4,854.60.