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So far, your meter display presents wired-in data:
the title is Untitled and the pointer is in the middle. The next
step toward a real meter is to define MeterGraphPane with instance
variables for the minimum and maximum values expected, for a value, and for
a title. The following includes those instance variables, as well as
listing ColorConstants in the pool-dictionary specification, for
use later, in Segment••missing reference••.
MeterGraphPane class definition
GraphPane subclass: #MeterGraphPane
instanceVariableNames: 'min max value title'
classVariableNames: ''
poolDictionaries: 'ColorConstants'