Where is the fuse or relay that. Control the

Instrument cluster gauge problem not fuse or relay . GM had bad stepper motor's inside the cluster that drives the gauges . 2003 to 2006 . You have to have it sent out to be fixed , unless you know how to solder electronic componets.
How to repair GM Instrument Cluster Speedometer Gauge Stepper

Do the light's on the instrument cluster work ? Fuse #24 - 20 amp location intergrated power module , under hood fuse box . Probably the instrument cluster it's self is bad , but without testing that would be a guess . Hooking up a factory or professional scan tool to view input's to the instrument cluster would be the proper way to diagnose. Gauge info to the Instrument come's over PCI serial data bus . A communication network for the control modules on the vehicle . Gauge info. come's from the PCM - powertrain control module. Your best bet , take it to a qualified repair shop ,dealer etc....

Checked voltage where ?
The instrument control module (ICM) controls power to the power window system by activating or deactivating the delayed accessory relay.
Symptom Chart Condition Possible Sources Action

• All power windows are inoperative

• Fuse(s).
• Circuitry.
• Instrument cluster module (ICM).
• Accessory delay relay.
• Driver window control switch.

• Go To Pinpoint Test A .

Vehicles equipped with remote keyless entry (RKE) have an illuminated entry feature, which enables the instrument cluster module (ICM) to illuminate the interior lamps (and if equipped, the puddle lamps in the exterior mirrors) when an unlock signal is received from the vehicle security module through the UBP network, or when any of the doors are opened. The ICM controls the interior lamps illuminated entry feature by activating the battery saver relay. When active, the illuminated entry feature will be canceled when any of the following conditions are met:
Instrument Cluster Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1342 ECU is Defective Instrument Cluster Module REFER to Section 413-01 . B2499 Courtesy Lamp Output Failure Instrument Cluster Module Go To Pinpoint Test A . B2659 Courtesy Switch Fault Instrument Cluster Module Go To Pinpoint Test C . - All Other DTCs Instrument Cluster Module REFER to Section 419-10 . Do you have a professional grade scan tool ? If not your best bet would be to take your vehicle to a qualified repair shop .

Two things. The ground wire from the cluster is loose or the power wire to the cluster may be loose at the connector.

the whole gauge cluster works off the same fuse, however there are stepper motors that control each gauge. Repairs can be done via small electronic repair shops, but the best known repair is to replace the whole cluster. They run about $400

Have you checked the fuse for the gauges ?
If the fuse has voltage, it could be something in the circuit board inside the cluster.

This solution will be of great help to you,even in the case of future or other dashboard problems;
Instrument cluster consists of electronic analog gauges, various warning lights, and optional tachometer. Vehicles equipped with tachometer have an electronic vacuum fluorescent transmission range indicator (PRND3L),odometer and trip odometer display. Vehicles without tachometer are equipped with a cable-operated transmission range indicator.
Instrument cluster is equipped with the following warning lights:
Battery voltage.
Cruise (speed control).
Door ajar.
Fasten seat belt.
Lift gate ajar.
Low fuel level.
Low windshield and washer level.
Traction Control.
The Body Control Module (BCM), which receives input from various sensors, sends display information to instrument cluster and operates gauges. Instrument cluster incorporates a self-test diagnostic feature to identify electronic problems. BCM, Powertrain Control Module (PCM), and Transmission Control Module (TCM) are continuously monitored by the diagnostic system.

SELF-DIAGNOSTICS
With ignition off, press and hold TRIP and RESET buttons while turning ignition switch to ON position. Continue to hold TRIP and RESET buttons until odometer window displays CODE (approximately 5 seconds). If problem exists, system will display diagnostic trouble codes. See DIAGNOSTIC CODE CHART table. If no problem exists, Code 999 (end test) will be displayed.
DIAGNOSTIC CODE CHART
CodeDescription
110.......Cluster Memory Fault
111.......Cluster Calibration Fault
905.......No CCD Bus Message From TCM
921.......Odometer Fault From BCM
940.......No CCD Bus Message From PCM

After diagnostic code display ends, instrument cluster will go into each of the following tests in order:
Dim test.
Calibration test.
Odometer segment test.
Electronic Transmission Range indicator segment test.
Dim Test
CHEC-0 will be displayed in odometer window. Instrument cluster will dim Vacuum Florescent (VF) display. If VF displays do not dim, a problem in instrument cluster exists. See BODY CONTROL COMPUTER TESTS in BODY CONTROL COMPUTER article.
Calibration Test
CHEC-1 will be displayed in odometer window. Each of instrument cluster gauges will move sequentially through each calibration point. See GAUGE CALIBRATIONS table. If gauge needle is not calibrated properly, a problem in instrument cluster exists.

Odometer Segment Test
CHEC-2 will be displayed in odometer window. Each segment of odometer will light sequentially. If any segment does not light, replace instrument cluster.
Electronic Transmission Range Indicator Segment Test
CHEC-3 will be displayed in odometer window. Each segment of electronic transmission range indicator will light sequentially. If any segment does not light, replace instrument cluster.

Here you go. Under hood fuse block
Ign. Fuse E
and
ipc/dic
both fuses are 10 amp
I hope this helps. Take care.

if the fuse checked out and is good, it is most likely the speed sensor on the side of the transmission

VOLTAGE REGULATOR
Located behind the instrument cluster
It is attached to the rear panel of the cluster.
input from battery is 10Volts, it regulates down to 5Volts
Any higher voltage inputed will overload the capacitors and resistors will burn,
Also check power distribution center, under hood upper motor area in drivers corner, check all relays and fuses.
Before you rip in to the dash check all ground wires, battery to ground, harness grounds, driver/passenger mid fram rail, Fuel sender is also ground to top of gas tank. IF ALL gauges do not work, that just leaves voltage regulator and/or cluster is malfunction,