As an animation effect this should be in uGearsRender. Plus it'll still spark when paused then, which is kinda fun.
<level-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:maxLevel="1" android:drawable="@drawable/hogcount1" />
<item android:maxLevel="2" android:drawable="@drawable/hogcount2" />
<item android:maxLevel="3" android:drawable="@drawable/hogcount3" />
<item android:maxLevel="4" android:drawable="@drawable/hogcount4" />
<item android:maxLevel="5" android:drawable="@drawable/hogcount5" />
<item android:maxLevel="6" android:drawable="@drawable/hogcount6" />
<item android:maxLevel="7" android:drawable="@drawable/hogcount7" />
<item android:maxLevel="8" android:drawable="@drawable/hogcount8" />
</level-list>