This is really simple to do. First off turn on your ignition but do not start. Now quickly press and hold the trip button down for at least 5 to 10 seconds. The hour meter should be displayed in the odometer with Hr and then the number of hours next. This way you can base your maintenance on hours if you tend to idle quite a bit.  

Does that work for all 3rd generation trucks?

Just now, Tractorman said:

Does that work for all 3rd generation trucks?

Yes sir I just tested this on Thor and works perfectly.

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