GM does ~$166B in revenue per year and they are worth $61B. GM's P/S is 0.37.
Tesla does ~$12B in revenue per year and they are worth $56B. Tesla's P/S is 4.67
I'd argue that Wall Street has an extremely optimistic view of Tesla's future since they are worth 12-15x more than Ford and GM on a revenue basis. I can't really compare on a profit basis since Ford and GM are profitable and Tesla has never made a profit and their production/delivery numbers have been basically flat (~25k units) per quarter for a year and a half.
