Tesla’s electric semi-trucks have gone into production after years of delays, company chief Elon Musk tweeted on Thursday. Deliveries to drinks and food product firm Pepsi will start on December 1. How many units were being sent out was not disclosed. Musk said the semi-trucks being produced were the versions with a range of about 800 kilometres. The Tesla Semi semi-truck was unveiled by Musk at the end of 2017 and, at the time, production was promised for 2019. After that, however, Tesla preferred to use existing capacity in battery production for passenger cars such as Model 3 and Model Y. M…