Speedhut 4″ 4K RPM Shift-light Tachometer (R4-TC1-REV)

The Speedhut 4″ 4K RPM Shift-light Tachometer (R4-TC1-REV) is an essential instrument for drivers seeking precise engine speed monitoring and improved performance. This analog gauge, with its clear 4-inch display and 0–4,000 RPM range, is specifically calibrated for optimal use with gasoline engines. A key feature is its intensely bright, internal shift light, which can be easily calibrated to alert drivers at specific RPM thresholds, leading to more efficient gear changes and maximizing engine power. Designed for broad compatibility, this tachometer works seamlessly with standard spark plug ignition systems across 1 to 12 cylinder engines, requiring only a tach signal over one volt and eliminating the need for specialized adapters. Its robust construction and straightforward installation make it a valuable addition to any performance-focused vehicle.

KEY FEATURES AND BENEFITS:

• Precise RPM Monitoring: Provides accurate, real-time readings of your engine’s revolutions per minute, crucial for optimal performance and preventing over-revving.
• Adjustable Shift Light: Features a built-in, intensely bright shift light that can be calibrated from 1/2 pulse to 6 pulses per revolution, allowing for customized visual cues for perfect gear shifts.
• Wide Compatibility: Designed to function with any gasoline engine utilizing a standard spark plug ignition system and delivering a tach signal exceeding one volt, supporting configurations from 1 to 12 cylinders.
• Easy Installation: The included mounting ring and harnesses facilitate a relatively simple installation process into a standard 4-inch dashboard opening.
• Enhanced Performance: By providing timely shift prompts, the tachometer helps drivers maintain their engine in the optimal power band, leading to improved acceleration and overall vehicle responsiveness.

SPECIFICATIONS:

• Gauge Type: Tachometer
• Range: 0 – 4,000 RPM
• Size: 4 inches
• Hole Size: 3.95 inches (100mm)
• Shift Light: Internal, calibratable
• Compatibility: 1–12 cylinder gasoline engines with standard spark plug ignition systems (tach signal > 1 volt)
• Included:
• Gauge Mounting Ring
• 3 ft Power & Lighting Harness – for LED Lit Gauges and Clocks
• 8 ft Tachometer Harness – for LED Lit Gauges (1 Wire 2 Pin Connector)

HOW TO USE:

1. Mount the Gauge: Locate a suitable 4-inch (100mm) diameter opening in your vehicle’s dashboard. Secure the tachometer in place using the provided gauge mounting ring.
2. Connect the Power Harness: Connect the 3 ft Power & Lighting Harness to a suitable power source in your vehicle, typically a 12V ignition-switched power supply and a ground connection. This harness also powers the LED illumination.
3. Connect the Tachometer Harness: Attach the 8 ft Tachometer Harness to the appropriate tachometer signal wire from your vehicle’s ignition system. This is usually connected to the negative (-) side of the ignition coil or the designated tachometer output from your engine control unit (ECU).
4. Calibrate the Shift Light (Optional): Once the tachometer is functioning, you can calibrate the internal shift light to activate at your desired RPM. This process typically involves adjusting a setting on the gauge according to the manufacturer’s instructions to match your engine’s optimal shift points. The calibration can often be set based on the number of pulses per revolution your engine produces (from 1/2 to 6).
5. Verify Operation: Start your vehicle and observe the tachometer readings to ensure they are accurate. Check that the shift light illuminates at the pre-set RPM.

BENEFITS OF USING THE SPEEDHUT 4″ 4K RPM SHIFT-LIGHT TACHOMETER (R4-TC1-REV):

• Optimized Gear Changes: The clear visual cue from the calibrated shift light allows for precise and timely gear shifts, maximizing your engine’s power output and efficiency.
• Engine Protection: By closely monitoring RPM, you can avoid over-revving your engine, which can lead to potential damage and reduced lifespan.
• Improved Driving Performance: Maintaining your engine in its optimal power band results in better acceleration, responsiveness, and overall driving experience, especially during performance driving or racing.
• Easy Integration: The standard 4-inch size and included mounting hardware ensure a straightforward installation process in most vehicles.
• Clear and Accurate Readings: The analog display provides immediate and easily understandable RPM information, crucial for quick decision-making while driving.

FEATURES:

• Analog display offers a traditional and easily readable format for engine speed.
• Internal microprocessor ensures highly accurate RPM readings.
• High-torque stepper motor provides precise and smooth pointer movement, even under demanding conditions.
• Slim case design allows for versatile mounting options without protruding excessively.
• LED backlighting enhances visibility during nighttime driving.
• Compatible with a wide range of gasoline engines (1–12 cylinders) utilizing standard ignition signals.
• Calibratable shift point allows customization of the RPM at which the shift light activates.
• Direct wiring connects to power and tachometer signal without the need for complex adapters in most setups.