[Mike]

without knowing anything about your motor that's imposable to tell. you will want to set the window switch a couple hundred rpm under the rev limiter in case something fails. that as you know will depend on your cam, valve train, and tune.

on the bottom end, you want it high enough to be able to get the car out of the hole and be ensured of traction, but not so low that it shuts off immediately after each shift lifting slightly while shifting will turn the wot switch off, then you want to still be in the window as you catch the next gear......