WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, DLC, Tachometer And Speedometer Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Indicators Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Temperature, Fuel Level And Oil Pressure Gages Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 4: Fuel Level Signals Schematic (W/FFS)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Driver Information Center, Engine Oil Temperature Gage Sensor And Dimmer Switch Schematic