Here are the most common issues with GM (Escalade, Tahoe, Suburban, Trailblazer...) speedometers. (03-06):

Here are the symtoms:

-Faulty gauge(s), especially the Speedo and/or the Tachometer act crazy then gradually become sticky, then dead, inoperable.

-Dim display at PRND321 indicator.

For the  model year 00-02( Tahoe , Yukon..) The common issues: The Speedo and or Tach gauge(s) suddenly fail to operate.

The cost to fix them : $95(to fix one gauge) or $190(to fix all gauges) .Warranty:1yr or15K miles whichever comes first. Same day service. Original mileage and data will remain the same.   

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        Contact: Initial contact must be thru Email: info@LAspeedometer.com , we're in the LA, CA area and will reply within 1 hr