DETROIT/SAN FRANCISCO (Reuters) – Fiat Chrysler will recall 1.4 million vehicles in the United States to install software to prevent hackers from gaining remote control of the engine, steering and other systems in what federal officials said was the first such action of its kind. The announcement on Friday by FCA US LLC, formerly Chrysler Group LLC, was made days after reports that cybersecurity researchers used a wireless connection to turn off a Jeep Cherokee’s engine as it drove, increasing concerns about the safety of Internet-enabled vehicles.