Your max rev limit will be about between 6300 and 6900, more than likely the upper end of the scale.
Its probably best to have the shift light come on about 6000 rpm, this then give you time to react to the light and take your foot off the accel, by this time it should be just before the limiter.
Best way to set it is to have a play really! If it goes wrong you car will just hit the rev limiter and wont go any further. Just make sure the engine is very warm when you do this and it shouldnt cause any damage.