Indian benchmark equity indices, Sensex and Nifty, saw marginal gains in early trading, navigating a cautious global environment marked by elevated crude oil prices and significant declines in US markets.Photograph: Francis Mascarenhas/ReutersSensex and Nifty50 Performance: Key Market Highlights TodayIndian benchmark equity indices, Sensex and Nifty, opened positively but turned volatile before trading marginally higher.Global markets exhibited caution, with major US indices falling and Brent crude remainin ...