Use the Edit Scales common dialog (see figure below) to edit scales from within the Gauge wizard.
It is also possible to edit scales using the Scales Tab of either the Gauge Designer or Sub-Gauge Designer dialogs.

Figure 1: Edit Scales dialog.
Scales
All scales of the current gauge will be displayed in this dropdown listbox.
Use the listbox to select the scale that you want to change.
The syntax of the scale names displayed in the listbox is as follows: <type of parent gauge element>-<name of parent gauge element>-Scale-<name of scale>.
There are two types of scales: circular scales that are used for circular gauges, and linear scales which are used for linear gauges. For more information about scales see the Scales topic.
Minimum
Determines the minimum (i.e. starting point) of the currently selected scale.
To use an expression click on the
icon and then set your expression. For more
information see the Report Expressions topic.
If an expression is used then a Gauge formula can be applied by clicking on the
icon and then selecting the desired formula. The results of this calculated formula will then be used as the scale's minimum.
To set tickmark and label intervals please use the Scales Tab of either the Gauge Designer or Sub-Gauge Designer dialogs.
Maximum
Determines the maximum (i.e. end point) of the currently selected scale.
To use an expression click on the
icon and then set your expression. For more
information see the Report Expressions topic.
If an expression is used then a Gauge formula can be applied by clicking on the
icon and then selecting the desired formula. The results of this calculated formula will then be used as the scale's maximum.
To set tickmark and label intervals please use the Scales Tab of either the Gauge Designer or Sub-Gauge Designer dialogs.
Getting Started
Using The Gauge Control
Gauge Elements
Scales
General Designer Topics
Report Expressions
Gauge Designer Dialog
Scales Tab
Sub-Gauge Designer Dialog
Scales Tab for Sub-Gauges