Me: "Driver, what's your letter?"
Me: "Race car driver.... Find your letter... GO!!!"
Then Takeshi would race to the matching uppercase letter. If he wasn't sure, I would slightly move the correct flashcard for a hint.
Here is a download Alphabet in excel form to use for the small letters that attach to the car.
Source: Teach Your Child to Read in 20 Minutes a Day" by Barbara J. Fox