The instrument that you are describing is an electrinic compass - I have the same vehicle with a handbook! According to the handbook the compass shows the position of the vehicle by the 16 azimuth system when the ignition is placed in the on position. That means that you have N,S,E,W, travel direction indication, each graduation = 22.5 degrees. Basically the compass rotates to show you the direction that your truck is going.
If the compass is not working correctly (if you have taken it overseas...) it will probably start flashing and not read correctly. To reset it, press the adjustment button marked S to the lower right of the compass for 1 second. Now turn the vehicle through 360 degrees (say in a quiet carpark or field etc). This should reset the compass and return it to normal operation.
If you are still struggling, I can scan the relevant pages and e mail them to you.
Best Regards. Christo
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