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The blue/gray wire on the blue connector on the gauge goes to many places in the center console to light up the backlight for the climate control unit, the radio, buttons, ash tray compartment, etc. Check to make sure that is not shorted to ground somewhere back there.
I had a problem with my gauge cluster backlight not working and it was because the blue/gray wire was shorted to ground behind the radio. The gauge backlight connects directly to the blue/gray wire.
I highly recommend getting a wiring diagram from the Bentley manual and following all the wires through.
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