The Sensex on Monday scrambled for ways, but closed above the base line for the eighth straight session even as Standard and Poor’s kept India’s sovereign credit rating unchanged. The broader NSE Nifty too moved sideways multiple times before ending a tad higher. The outcome of the upcoming OPEC meeting on oil supply and F&O expiry this week kept investors on the sidelines. The 30-share barometer opened lower and stayed in the red for the most part of the day.