Tata Electronics Pvt. is preparing to make India’s first semiconductor wafers on far older technology than it originally expected, underscoring the challenges the country faces in trying to build a domestic chip industry from scratch. The tech arm of the sprawling Tata conglomerate is preparing to build the country’s first large-scale chip fab or production plant mostly based on 90-nanometer process technology at its facility at Dholera in western Gujarat state, said people familiar with the matter, who asked not to be identified discussing private deliberations.