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If the RPM gauge in your 2006 Dodge Ram 1500 isn't functioning, it is likely due to an issue with one of the engine speed sensors. These sensors within the engine measure its rotational speed and transmit that data to the ECU, which then relays it to the gauges. If your gauges are malfunctioning, the problem could also stem from the ECU itself. Typically, you can utilize an OBD II scan tool to check for any faults detected in the system and address them accordingly. Another possible cause for the non-functional RPM gauge is a failure in the gauge's motor, though this is a less frequent occurrence compared to the other potential issues.
If the speedometer or odometer isn't functioning properly in your 2006 Dodge Ram 1500, it's probably due to a faulty speed sensor or malfunctioning wires.
It is highly probable that the sensor positioned above the rear axle is the cause.