Tesla needs to figure out how to sell cars. Its salespeople say it's stuck in the past.

• Tesla's delivery numbers dropped for the second straight quarter in July.
• The company has been scrambling to gin up orders and switch up its sales tactics over the past year.
• Business Insider spoke with 14 current and former staff who described Tesla's shifting sales strategy.

Once, Tesla raced to produce enough cars to meet demand. Now the company is scrambling to find customers to buy them.