Sell Tesla, Buy Cummins (CMI):Musk is over-promising again. After announcing the efficiency and range for the Tesla Semi, Cummins is down hard. Cummins makes diesel and NG (natural gas) engines. Tesla has yet to prove it will successfully mass-produce the Model 3. Cummins will recover. Tesla will go down. Agree or disagree?Login now to vote. Join the group of Value Stocks. With 800 members strong.