[renzop]

A shift light will only help you with up shifts. If you overrevved because you down shifted at too high of a speed for the gear you were going into then a shift light will not help.

Also, for a track day, why in the world would you be upshifting at redline anyway? You are not competing, give the engine a break! Our cars do not produce max HP at redline. By the time you get to redline the power curve has started to fall off.

You said you did not have time to look at the tach. Then something is really wrong. This is NOT A RACE. Slow down until you can calmly do whatever you need to do, like look at the tach when its approaching shift time. Your car and your instructor will thank you.

Do yourself and your car a favor, forget the shiftlight and try to shift earlier. If you lose a few tenths of a second so what?