My sincere compliments to
johnwillimas2 for pointing out the compass issue, and my appologies to Keith (who has probably given up on me) for discreetly trying to point me North!
Well, Roman has most graciously provided me with a perfect replacement code, using existing bitmaps. The compass is working faultlessly in both FS9 and FSX without the need for model corrections.
Thank YOU, Roman! 
I will upload the updated version of 'AVRO_compass', but for those of you who are comfortable with hand editing xml gauges, here is the entire new coding:
<Gauge Name="compass_popup" Version="1.0">
<Image Name="AVRO__compass.bmp"/>
<Element>
<Position X="150" Y="150"/>
<Image Name="compass_popup_needle.bmp" PointsTo="South">
<Axis X="85" Y="86"/>
</Image>
<Rotate>
<Value>(A:Wiskey compass indication degrees,degrees)</Value>
<Nonlinearity>
<Item Value="0" Degrees="-90"/>
<Item Value="180" Degrees="90"/>
<Item Value="360" Degrees="-90"/>
</Nonlinearity>
</Rotate>
</Element>
<Element>
<Position X="150" Y="150"/>
<Image Name="compass_popup_crosswires.bmp" PointsTo="North">
<Axis X="85" Y="86"/>
</Image>
<Rotate>
<Value>(A:AUTOPILOT HEADING LOCK DIR, degrees)</Value>
<Nonlinearity>
<Item Value="0" Degrees="-90"/>
<Item Value="180" Degrees="90"/>
<Item Value="360" Degrees="-90"/>
</Nonlinearity>
</Rotate>
</Element>
<Mouse>
<Area Name="AVRO HEADING REFERENCE DOWN" Left="0" Top="0" Width="150" Height="300">
<Tooltip ID="">AVRO Compass (Heading %((A:Wiskey compass indication degrees,degrees))%!d!°, Reference %((A:AUTOPILOT HEADING LOCK DIR, degrees))%!d!°) - R. Click to toggle 2D compass.</Tooltip>
<Cursor Type="DownArrow"/>
<Click Repeat="Yes" Kind="LeftSingle+RightSingle">
(M:Event) 'RightSingle' scmp 0 == if{ 75 (>K

ANEL_ID_TOGGLE) } els{ (>K:HEADING_BUG_DEC) }
</Click>
</Area>
<Area Name="AVRO HEADING REFERENCE UP" Left="150" Top="0" Width="150" Height="300">
<Tooltip ID="">AVRO Compass (Heading %((A:Wiskey compass indication degrees,degrees))%!d!°, Reference %((A:AUTOPILOT HEADING LOCK DIR, degrees))%!d!°) - R. Click to toggle 2D compass.</Tooltip>
<Cursor Type="UpArrow"/>
<Click Repeat="Yes" Kind="LeftSingle+RightSingle">
(M:Event) 'RightSingle' scmp 0 == if{ 75 (>K

ANEL_ID_TOGGLE) } els{ (>K:HEADING_BUG_INC) }
</Click>
</Area>
</Mouse>
</Gauge>