Glen,
The problem is in your instrument cluster itself. It's a common issue on the 03-06 Yukons and it is repairable. Check this page for details and how to get it fixed - Yukon Instrument Cluster Repair
-Dr
I suspect that your sender is malfunctioning. Todays speedometers and RPM is sent from a sensor/sender near the drive shaft. A magnet on the drive shaft is sensed and the revolutions are converted to RPM and speed.
For information see:
http://wiki.answers.com/Q/Speedometer_on_2003_Yukon_XL_doesn%27t_work_most_of_the_time_is_this_a_common_problem_how_much_to_fix_it
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