4909977 | Genuine International® Speedometer Gauge MPH 4-WAY

Part number is a direct factory replacement gauge for the dashboard instrument cluster on Class 7 and Class 8 International® truck models:

• International® ProStar: Heavy-duty highway tractors.

• International® DuraStar: Medium-duty vocational trucks (4300 / 4400 series).

• International® WorkStar: Heavy-duty vocational and dump trucks (7300 / 7400 / 7500 / 7600 series).

• International® LoneStar: Premium highway long-haul trucks.

• International® TerraStar: Class 4/5 commercial work trucks.

1. What is it?

Part is a multiplexed electronic speedometer gauge installed in the main instrument cluster. It displays vehicle speed in miles per hour (MPH) by processing electronic signals transmitted across the vehicle’s J1939 CAN-bus network from the engine control module (ECM) or transmission speed sensor.

2. Core Functions & Technical Features

• 4-Way Electrical Connector: Connects directly into the vehicle’s multiplexed instrument cluster harness via a rear 4-pin plug-and-play connector.

• J1939 CAN-Bus Signal Input: Receives digital speed data over the data bus rather than relying on mechanical cables or direct analog sensor leads.

• Dual Scale Display: Features a primary MPH scale with secondary km/h markings for clear readability.

• Backlit OEM Display: Equipped with factory night illumination and stepper-motor pointer precision for accurate speed tracking without needle flutter.

1. Erratically Jumping or Stuck Needle

• Symptom: The speedometer needle bounces erratically, sticks at a specific speed (e.g., resting at 30 MPH while stopped), or sweeps to max scale and stays pinned.

• Cause: Internal stepper motor mechanical failure, stripped gear teeth, or failing pointer circuitry within the gauge housing.

2. Complete Inoperative Gauge (Dead Speedometer)

• Symptom: The speed pointer remains dead at 0 MPH while driving, even though the odometer continues to track mileage or the vehicle operates normally.

• Cause: Internal power circuit failure on the gauge PCB, blown fuse, or broken internal traces in the 4-pin connector interface.

3. Intermittent Speed Reading Drops

• Symptom: The needle suddenly drops to zero while driving down the highway, then abruptly jumps back up to the current driving speed.

• Cause: Poor electrical pin contact on the 4-way rear harness, loose cluster connector, or intermittent J1939 CAN-bus signal loss.

4. Failed Instrument Backlighting

• Symptom: The gauge pointer moves accurately, but the gauge dial face remains dark or flickers during night operation.

• Cause: Burnt-out internal LED backlights or damaged trace lines supplying illumination power via the 4-way pin connector.