Description
The Speedhut 4-1/2″ 8K RPM Shift-light Dash Mount Tachometer (R45-TC3-REV) is an essential instrument for drivers who need accurate and immediate feedback on their engine’s revolutions per minute. This gauge is designed for dash mounting and provides a clear, easy-to-read display of RPM up to 8,000. Featuring an integrated shift light, it allows drivers to optimize their gear changes for peak performance and efficiency. Its compatibility with a wide range of engines and ignition systems makes it a versatile choice for various vehicles.
KEY FEATURES AND BENEFITS:
- Precise RPM Monitoring: Accurately displays engine speed up to 8,000 RPM, providing crucial information for vehicle operation.
- Integrated Shift Light: Features a built-in, highly visible shift light that alerts the driver to optimal shift points, enhancing performance and preventing over-revving.
- Wide Compatibility: Designed to work with standard spark plug ignition systems and is compatible with engines having 1 to 12 cylinders, offering broad application across different vehicles.
- Convenient Mounting: The 4-1/2 inch size and dash mount design, along with the included mounting ring, ensure secure and straightforward installation in most dashboards with a 4.250-inch (108mm) opening.
- Complete Wiring Included: Ships with a 3 ft Power & Lighting Harness for LED illumination and an 8 ft Tachometer Harness, simplifying the wiring process.
SPECIFICATIONS:
- Gauge Type: Tachometer
- Range: 0 – 8,000 RPM
- Size: 4 1/2 inch
- Hole Size: 4.250 inches (108mm)
- Internal Shift Light: Yes
- Mount Style: Dash Mount
- 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:
- Preparation: Identify a suitable location on your vehicle’s dashboard for mounting the tachometer, ensuring there is enough clearance behind the panel for the gauge and wiring.
- Drilling (if necessary): If there isn’t an existing 4.250-inch (108mm) opening, carefully drill one in the chosen location.
- Mounting the Gauge: Insert the tachometer into the drilled opening from the front of the dashboard. Secure it using the included gauge mounting ring from the back of the dashboard.
- Wiring – Power and Lighting: Connect the 3 ft Power & Lighting Harness. Typically, this involves connecting the power wire to a 12V ignition source, the ground wire to a suitable ground point on the vehicle chassis, and the lighting wire to the vehicle’s headlight or instrument panel light circuit (if desired for illumination).
- Wiring – Tachometer Signal: Connect the 8 ft Tachometer Harness. The signal wire from this harness needs to be connected to the tachometer signal source in your vehicle. This is typically the negative side of the ignition coil for standard spark plug ignition systems. Do not connect directly to a spark plug wire.
- Calibration (if required): Some tachometers may require calibration based on the number of cylinders in your engine. Refer to the manufacturer’s specific instructions for setting the pulses per revolution if necessary. This often involves a configuration process upon initial power-up.
- Testing: Once all connections are made, start your vehicle and observe the tachometer to ensure it is reading the RPM accurately and that the shift light functions as expected.
BENEFITS OF USING THE SPEEDHUT 4-1/2″ 8K RPM SHIFT-LIGHT DASH MOUNT TACHOMETER (R45-TC3-REV):
- Provides clear and instantaneous understanding of engine speed for better vehicle control and performance.
- Integrated shift light aids in making timely, precise gear changes for improved acceleration and fuel efficiency.
- Helps reduce wear on engine and transmission by preventing over-revving.
- Simple installation process with included wiring makes it accessible for all users.
FEATURES:
- Displays real-time engine speed up to 8,000 RPM for accurate performance monitoring.
- Built-in shift light offers clear visual cue for shifting gears efficiently.
- Easy dashboard installation using the included mounting ring.
- Compatible with 1 to 12 cylinder engines using standard spark plug ignition systems.
- Supplied with power, lighting, and signal wiring harnesses for straightforward setup.






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