OperATION
66
ADJUST TIRE SIZE
The tire size function allows you to adjust the speed that the GT will display in one of the
gauge locations to account for larger or smaller than stock tire sizes. The range of tire
sizes that the GT will adjust for starts at 28” and goes up to 39” and it adjusts in incre-
ments of .25”.
®
Go back
TIRE sIZE
*
Ac
curate only if
ECM tire size
setting are at
default factory
values.
DEFAULT
Notice that the selected tire size is displayed in the
box on the left side of the screen. Once the correct
speed is highlighted simply press the go back button
to exit. Your selection will automatically be saved.
Use the Up Down Buttons to scroll up and down
through the available tire sizes: highlight the tire
size that fits what is currently installed on the vehicle
in order for the GT to display the accurate speed.
default setting:
The default setting reads the speed directly off of the vehicle’s computer. Use this setting if
you have already calibrated the speedometer for larger or smaller aftermarket tires.
