Benchmark indices staged a strong rebound on Tuesday, led by gains in IT and auto stocks. Sensex rose 335.97 points to 83,871.32, while Nifty gained 120.60 points to 25,694.95. BEL, Adani Ports, and M&M led gains, whereas Bajaj Finance and ONGC dragged. Nifty IT jumped 1.2%, Auto 1.07%.