Description
The Speedhut 3-3/8″ 4K RPM Shift-light Diesel Tachometer (R3-TC6-REV) provides precise monitoring of your diesel engine’s revolutions per minute (RPM) up to a maximum of 4000. Designed with a clear, easy-to-read 3 3/8 inch (85mm) gauge face, this instrument offers vital information for optimizing your vehicle’s performance and ensuring smooth operation. The integrated shift light adds a crucial visual aid, allowing drivers to make timely and accurate gear changes, contributing to improved efficiency and preventing over-revving. This tachometer is specifically engineered for diesel engines, utilizing a Hertz-based signal for accurate RPM readings. Installation is streamlined with the included wiring harnesses, making it a practical addition to any diesel vehicle.
KEY FEATURES AND BENEFITS:
- Accurate RPM Monitoring: Provides precise readings of your diesel engine’s RPM up to 4000, allowing for optimal engine management.
- Integrated Shift Light: Features an internal shift light that visually indicates the ideal shift points for maximizing performance and efficiency.
- Diesel-Specific Compatibility: Engineered to work specifically with diesel engines using a Hertz signal.
- Convenient Size: The 3 3/8 inch (85mm) size ensures it fits standard gauge openings.
- Easy Installation: Ships with a 2-wire cable wiring harness and a separate power and lighting harness, simplifying the setup process for LED illumination.
SPECIFICATIONS:
- Gauge Type: Tachometer
- Signal Type: Diesel (Hertz)
- Range: 0 – 4000 RPM
- Size: 3 3/8 inch
- Hole Size: 3.33 inches (85mm)
- Internal Shift Light: Yes
- Included:
- Wiring Harness (2-Wire Cable)
- 3 ft Power & Lighting Harness – for LED Lit Gauges and Clocks
HOW TO USE:
- Mount the Tachometer: Locate a suitable 3.33″ (85mm) diameter opening in your vehicle’s dashboard or instrument panel. Secure the tachometer in place.
- Connect the Power and Lighting Harness: Attach the 3 ft power and lighting harness to the designated terminals on the back of the tachometer. Connect the power wire to a 12V power source that is switched with the ignition. Connect the ground wire to a suitable ground point. The lighting wires will power the LED illumination of the gauge when your vehicle’s lights are turned on.
- Connect the Signal Wire: Using the 2-wire cable wiring harness, connect one wire to the designated RPM signal output on your diesel engine’s control unit or alternator (this will vary depending on your specific vehicle; consult your vehicle’s service manual for the exact location). Connect the other wire to a suitable ground point.
- Test the Tachometer: Start your vehicle and observe the tachometer reading as the engine RPM changes. Verify that the shift light illuminates at the desired RPM.
BENEFITS OF USING THE SPEEDHUT 3-3/8″ 4K RPM SHIFT-LIGHT DIESEL TACHOMETER (R3-TC6-REV):
- Provides a clear and immediate understanding of engine RPM to improve fuel efficiency and prevent over-revving.
- Integrated shift light helps with timely gear changes, particularly useful for towing or performance driving.
- Enhances engine longevity by aiding in optimal RPM management.
- Simplified installation with included wiring harnesses for both signal and lighting connections.
- Specifically engineered for diesel engines to ensure accurate readings without needing signal converters.
FEATURES:
- Clear analog display for immediate RPM feedback.
- Illuminated dial enhances visibility in low light conditions.
- Compact 3 3/8″ size fits standard gauge openings seamlessly.
- Durable construction ideal for demanding automotive environments.
- Compatible with diesel RPM signals without requiring adapters.





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