Speedometer/ Fuel Gauge & Tachometer not working

Check your wiring connectors for loose wires. use a safety pin and push all the wires in from the back.

You might have to replace the speedometer cable

The speedometer gauge is controlled by information sent over the class 2 data bus from the PCM/ECM - engine computer . There is a VSS - vehicle speed sensor mounted on the transmission , this VSS is a input to the engine computer .
Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The IPC- instrument panel cluster receives the vehicle speed signal via a discreet wire. The IPC uses the vehicle speed signal circuit (4000 pulses/mile) from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit (4000 pulses/mile) exists.
Is the whole instrument cluster dead ?
Fuel Gauge
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gauge defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.
Reviewing the fuel system description will further explain how the system functions. Refer to:
• Fuel System Description in Engine Controls - 4.3 L
• Fuel System Description in Engine Controls - 4.8 L, 5.3 L and 6.0 L
• Fuel System Description in Engine Controls - 6.6 L
• Fuel System Description in Engine Controls - 8.1 L
Hourmeter
The IPC can display the accumulated engine run time hours using the VF display when the cluster is in the LOCK or ACC position. The IPC stores the accumulated engine run time hours in a non-volatile format. The accumulated hours will not change if the battery was disconnected or removed. When the ignition is OFF and the trip reset switch is pushed in and held for more than 4 seconds, the IPC will display the accumulated hours for 30 seconds. The hourmeter will reset to 0.0 when 10,000 hours are accumulated.
Odometer
The IPC contains a season odometer and a trip odometer. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the IPC. The IPC calculates the mileage based on the vehicle speed signal circuit from the PCM. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer can be configured to display either miles or kilometers.
PRNDL Display
The IPC displays the selected gear position as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the gear position. The PRNDL display blanks if:
• The PCM detects a malfunction in the transmission range switch circuit.
• The IPC receives a class 2 message indicating the park position and the column park switch indicates a position other than park (open input).
• The IPC detects a loss of class 2 communications with the PCM.
GM had problems with stepper motors that control the needle position .
Your best bet buy a used instrument cluster from the auto slavage yard .

You need new sensor. See Video: https://www.youtube.com/watch?v=x85coG2wG0I

This is a result of either a bad solder job at the factory or just bad solder. You can remove your gage cluster and remove and resolder the joints at the back of the 2 indicators. there are several sites on the internet that have specific instructions.

check the fuses. they are under the back seat just pull up on the lower part of the back seat and it will come out. fuse box is on the drivers side. check to see if water is getting in that could be the cause.

2005 Instrument cluster layout

1. Speedometer
2. Brake warning light
3. Turn signal indicator light
4. High beam indicator light
5. Malfunction Indicator Light (MIL)
6. Airbag warning light
7. Anti-Lock brake warning light
8. Tachometer
9. Security alarm indicator light
10. Oil pressure warning light
11. Electronic Stability Program (ESP)/
Traction Control System (TCS) indicator light
12. Tire Pressure Monitor warning light (base)

13. Temperature gauge
14. Electronic Vehicle Information Display
15. Tow/Haul indicator light
16. 4WD Low mode indicator light
17. Seat belt reminder light
18. Cruise control indicator light
19. Odometer/Trip Odometer
20. Transmission gear indicator
21. Fuel gauge
22. Electronic Throttle warning light (5.7 Hemi)
23. Front fog light indicator light
24. Voltage warning light

Did you check the fuses?

Hope this helps.



Item Part Number Description 1 — Instrument cluster 2 — Odometer reset shaft 3 — Air bag warning indicator 4 — RH turn signal indicator 5 — Charging system warning indicator 6 — Tachometer 7 — Low oil pressure warning indicator 8 — Brake system warning indicator 9 — Cruise control indicator 10 — Check fuel cap indicator 11 — Anti-lock brake system (ABS) warning indicator 12 — Check transmission indicator 13 — Odometer 14 — Transmission range selector indicator 15 — Trip odometer 16 — Theft indicator 17 — Low coolant indicator (if equipped) 18 — Safety belt warning indicator 19 — Low fuel warning indicator 20 — Fuel gauge 21 — Malfunction indicator lamp (MIL) 22 — Door ajar warning indicator 23 — Traction control indicator (if equipped) 24 — Engine coolant temperature gauge 25 — High beam indicator 26 — LH turn signal indicator 27 — Speedometer

Blown Fuse or fried Circuit board. Take to a local AutoZone, Advance, Murray's, O'reillys or a similar part house for them to check the wiring. I'm assuming the van does not use a mechanical Speedometer or Fuel Gauge.

On the plus side, with no speedometer, your indicated odometer mileage does not increase. Just keep your speed down and your tank full. Kidding, just kidding.