First question: Is it best to shift up as soon as the red light goes on? Or is it better to wait until you hit redline? Or somewhere in between?

2nd: Edit: nm, found the answer

Quote from Macels :

First question: Is it best to shift up as soon as the red light goes on? Or is it better to wait until you hit redline? Or somewhere in between?

2nd: Edit: nm, found the answer

The moment the red light comes on