I have to agree with CBODY67, most of them have probably never heard of a pushbutton automatic, not to mention, never seen one, or know how they operate
Go in armed with a smile, and the FSM book marked on the appropriate pages, and a little trivia, if they have a name tag or badge, call them by their name
Example:
Good afternoon Janet, how are you today? I've got an oldie but a goodie here, she was made before you were even born, and she's got a pushbutton automatic transmission, that operates a little different than what you're used to seeing
1964 was the last year for the pushbutton, the federal govt mandated that all cars in 1965 had a standard PRNDL, gear pattern, and since chrysler was never able to figure out how to have a park button instead of a lever, in 65 all chrysler went to a standard column shift like we have today, which is a shame cause they're really cool, and most people today have never even seen one, the 59 Edsel had the buttons in the middle of the steering wheel where the horn usually is now
Draw them in, get them interested in the uniqueness of the pushbutton, then bring out the FSM bookmarked to the page that explains it, highlight the instructions if you want
Let them understand how it operates before you even try to show them
I know it seems like you're kissing their ***, and it may leave a bad taste in your mouth, but as the saying goes, "you catch more flies with honey" applies here
My girlfriend is a graphic designer, and if she suddenly started talking about bleeds,kearning, CSS,, desktop vs mobile mode, legibility, flash I'd bet your eyes would start to glaze over, just like that inspectors eyes do when they see those buttons
But, its just a thought