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thinking about it some more, perhaps even the fancy shift linkage sensor isn't required.
it might be as simple as a controller that intercepts the throttle signal at the pedal, as well as the clutch depressed switch and brake depressed switch (with an on/off switch and potentiometer):
on? - no - throttle signal bypass
brake depressed? - no - throttle signal bypass
clutch depressed? - no - throttle signal bypass
yes to all above? - momentary 5v 'blip' to throttle via potentiometer (to control amount of blip)
so, driving along and everything normal. as soon as you brake AND depress clutch the throttle blips for the downshift. only turn on when at the track to avoid parking lot shenanigans.
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