Indian equity benchmarks BSE Sensex and NSE Nifty50 are likely to make a gap-up start on Thursday tracking gains across most global markets, after the Fed hikes the key interest rate by 75 basis points as widely expected. Singapore Exchange Nifty futures — an early indicator of the Nifty index — rose as much as 188.5 points or 1.2 percent to 15,859 ahead of the opening on Dalal Street.