Description
The Speedhut 4″ 10K RPM Shift-light Tachometer (R4-TC4-REV) is an essential instrument for drivers seeking precise engine speed monitoring and optimized gear changes. Featuring a bright, integrated shift light, this tachometer provides a clear visual cue to maximize your engine’s power and performance. Designed for compatibility with a wide range of vehicles utilizing standard spark plug ignition systems and engines with 1 to 12 cylinders, this gauge delivers accurate RPM readings even under demanding conditions. Its straightforward installation process, coupled with the included mounting hardware and wiring harnesses, makes it a valuable addition for achieving peak engine efficiency and responsiveness.
KEY FEATURES AND BENEFITS:
- Precise RPM Monitoring: Provides accurate real-time readings of your engine’s revolutions per minute, crucial for performance and engine management.
- Integrated Shift Light: Features intensely bright internal shift lights that can be calibrated to signal optimal gear change points, improving acceleration and preventing over-revving.
- Wide Compatibility: Designed to work seamlessly with any gas engine and tach signal over one volt, supporting 1 to 12 cylinder configurations using standard spark plug ignition systems.
- Easy Installation: The tachometer comes with all necessary wiring harnesses and a mounting ring, simplifying the installation process.
- Robust Design: Built to withstand demanding conditions, ensuring reliable performance and pointer precision, even in racing environments.
SPECIFICATIONS:
- Gauge Type: Tachometer
- Tachometer Signal Type: Standard spark plug ignitions systems
- Compatibility: 1-12 cylinder
- Range: 0 – 10,000 RPM
- Size: 4 inches
- Hole Size: 3.95 inches (100mm)
- Internal Shift Light: Yes
- Included:
- 3 ft Power & Lighting Harness – for LED Lit Gauges and Clocks
- 8 ft Tachometer Harness – for LED Lit Gauges (1 Wire 2 Pin Connector)
- Gauge Mounting Ring
HOW TO USE:
- Mount the Tachometer: Locate a suitable 3.95-inch (100mm) diameter opening on your vehicle’s dashboard or instrument panel. Insert the tachometer into the opening and secure it using the included mounting ring from the back.
- Connect the Power and Lighting Harness: Connect the 3 ft Power & Lighting Harness to the appropriate power and ground sources in your vehicle’s electrical system. This harness also provides power for the LED illumination of the gauge.
- Connect the Tachometer Signal Harness: Connect the 8 ft Tachometer Harness to a reliable tachometer signal source. For standard spark plug ignition systems, this is typically a wire connected to the negative (-) side of the ignition coil or a designated tachometer output from your vehicle’s ECU (Engine Control Unit). Ensure a secure connection using the 2-pin connector.
- Calibrate the Shift Light (if needed): The shift light can be calibrated based on your engine’s optimal shift points. Refer to the manufacturer’s instructions for specific calibration procedures, which often involve setting the desired RPM trigger point.
- Verify Functionality: Once all connections are made, start your vehicle and observe the tachometer’s readings as the engine RPM changes. Ensure the shift light activates at the set RPM.
BENEFITS OF USING THE SPEEDHUT 4″ 10K RPM SHIFT-LIGHT TACHOMETER (R4-TC4-REV):
- Precise RPM readings allow for better engine management, preventing potential damage from over-revving and ensuring optimal performance.
- Integrated shift light provides a clear and immediate visual cue for perfect gear changes, leading to improved acceleration and overall driving experience.
- Wide compatibility with various vehicles makes it a versatile and valuable tool for any driver using a standard ignition system.
FEATURES:
- Displays engine speed up to 10,000 revolutions per minute.
- Equipped with intensely bright internal LED shift lights for immediate visual alerts.
- Designed for seamless operation with standard spark plug ignition systems.
- Compatible with engines having between 1 and 12 cylinders.
- Requires a mounting hole of 3.95 inches (100mm) for installation.
- Provides the ability to calibrate for 1/2 pulse up to 6 pulses per revolution for accurate readings across different engine types.
- Includes a 3-foot power and lighting harness for easy electrical connection.
- Comes with an 8-foot tachometer signal harness for straightforward RPM signal acquisition.
- Features a mounting ring to ensure a secure and professional installation.






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