BMW 3.0 CSE

Gear selection in a Tesla drive unit is done electronically.  That's why so many electric cars have gear buttons instead of gear levers -- there's nothing physical that needs to move.  But, in trying to keep the original BMW aesthetic, I want to use the stock automatic transmission shifter to send signals to the Tesla drive unit.  

The Tesla Model S battery system in my car consists of 14 individual modules (a real model S usually has 16). Each are 27 by 11.5 by 3.5 inches in dimension and weigh 55.8 pounds. They consist of 444 individual 18650 battery cells with 74 cells in each voltage cell and six of these voltage cells in series.