I have the new rally GT and I did see that they recommend 6. however, if you want the best out of your kite, especially in the top end of its range. You will want to pump it hard to about 9 or even 10.
If you have the sligggy pump, just pump it till it's at the edge of the green and red on the gauge.
Forget PSI's and pump gauges. Kite Pump gauges are notoriously inaccurate. Pump your kite until it becomes hard to fold it in half i.e. you can still bend it but you need A LOT of force to do this.
On my rally I flick my leading edge with my finger after pumping, when it produces a higher pitched ping noise its spot on.. never had an issue in 15 years doing this
