If there's a B or 1 position just right of the 2, flip into that then back to normal and you should start in first. At least it works on my 560SL.
'97 SL500, 40th anniversary edition
'04 Olds Bravada (SWMBO's)
'06 Lexus ES330
'89 560SL (sold)
SL--Anything else is just a Mercedes.
(Kudos to whoever said it first)