Elon Musk recently told attendees at the South by Southwest festival that two things are keeping him up at night: an apocalyptic future created by artificial intelligence, and production delays of Tesla Inc.’s TSLA -0.32% Model 3 car. Mr. Musk has good reason to worry about Tesla. The auto maker is entering one of the most critical phases in its history, a make-or-break period in which Tesla must boost production of the Model 3 or possibly face severe financial consequences. In April, Tesla will reveal whether it is on track to meet an ambitious second-quarter target of producing 5,000 Model 3s a week—a goal that it already twice delayed. The Model 3 is Tesla’s mainstream electric-car offering, priced more affordably than Tesla’s luxury models, and a key part of Mr. Musk’s strategy to broaden the company’s business. Newsletter Sign-up Meeting the goal of 5,000 Model 3s a week by […]