Voltage regulation of 1.23V

The documentation for analogRead says that it maps, input voltage from 0-5 to 0-1023? But is my range 0-3.3?
I think the datasheet for the gyro mentions 1deg/sec maps to 1/1500 Volts

0-5vdc for 0-1023 counts is the default range for arduino analogRead statements. However if you change the reference to EXTERNAL and wire a 3.3vdc voltage to the Aref pin your analog Read range will become 0-3.3vdc = 0-1023 counts.

Lefty