This Is What Keeps Tesla Investors Up at Night

For Tesla (TSLA) - Get Report investors, it's all about deliveries. Even though the company, founded by Elon Musk, said production for its long-awaited Model 3 sedan is set to start in July, Tesla doesn't have the best track record of fulfilling orders. This is one big question mark for investors, according to Craig Erlam, senior market analyst at Oanda, based in London. The company delivered over 76,000 vehicles in 2016, down from a previous expectation of 90,000. Tesla shares are up some 40% from the beginning of December. TheStreet's Scott Gamm reports from Wall Street.