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Well that's 400k car and real reason LFA requires TFT screen is because the mechanical needle is not fast enough to show the RPM of LFA engine. I don't think 3IS is that fast.
Revving speed doesn't matter here. It's the visual effect, the coolness. That's the whole point of having this LFA gauge in the IS F-Sport. They ought to show these details in action, and not just the gauge moving left and right with some static menu display.