18W083311 | Genuine Mack® Instrument Cluster Gauge

• Speedometer – vehicle speed

• Tachometer – engine RPM

• Fuel gauge – fuel level

• Temperature gauge – engine coolant temperature

• Oil pressure gauge – engine lubrication status

2. Alert the Driver

• Some gauges include warning indicators or lights if readings are abnormal.

3. Aid in Safe and Efficient Driving

• Allows the driver to monitor vehicle performance and respond to issues quickly.

4. Integrates With Modern Vehicle Systems

• Some gauges are connected to the ECU to provide real-time, accurate readings.

1. Inaccurate Readings

• Speedometer shows incorrect speed

• Tachometer (RPM) jumps or stays at zero

• Fuel gauge stuck at full or empty

• Temperature gauge shows unrealistic readings

2. Gauge Doesn’t Move

• Needle remains in one position regardless of actual conditions

• Digital gauges may freeze or not update

3. Flickering or Intermittent Operation

• Gauge needle or display flickers

• Works sporadically or only after restarting the vehicle

4. Dead or Blank Gauges

• Entire gauge doesn’t display anything

• Backlighting may be off

5. Warning Lights Malfunction

• Some gauges include warning lights; failure may prevent them from illuminating

6. Erratic Needle Movement

• Needle jumps back and forth randomly

• Could indicate electrical or sensor connection issues

7. Multiple Gauges Failing

• If more than one gauge acts up, the cluster’s circuit board or power supply may be failing

8. Electrical or Fuse Issues

• Blown fuses or wiring problems can mimic gauge failure