Description
The Speedhut 4-1/2″ 10K RPM ShiftLight Dash Mount Tachometer (R45-TC4-REV) is an essential instrument for anyone looking to closely monitor their engine’s performance. This gauge provides accurate real-time RPM readings up to 10,000, allowing you to optimize your vehicle’s power and efficiency. Its integrated, intensely bright shift light serves as a crucial visual cue, helping you make precise gear changes at the ideal moment for maximum acceleration and performance. Designed for straightforward dash mounting, this tachometer is compatible with a wide range of gasoline engines, making it a versatile tool for various vehicles.
KEY FEATURES AND BENEFITS:
- Provides precise RPM readings: Up to 10,000 RPM.
- Integrated shift light: Features a built-in, intensely bright shift light for optimal gear changes.
- Wide ignition compatibility: Works seamlessly with standard spark plug ignition systems.
- Broad engine compatibility: Compatible with 1 to 12 cylinder engines.
- Easy installation: Designed for dash mounting and includes a mounting ring for secure installation.
- Programmable calibration: Offers pulse settings from 1/2 to 6 pulses per revolution (PPR).
- Reliable accuracy: Ensures accurate pointer movement even under demanding conditions.
- High signal compatibility: Works with any gasoline engine that has a tach signal over one volt.
SPECIFICATIONS:
- Gauge Type: Tachometer
- Range: 0 – 10,000 RPM
- Size: 4 1/2 inch (114mm outer diameter)
- Hole Size Required: 4.250 inches (108mm)
- Tachometer Signal Type: Standard spark plug ignition systems
- Compatibility: 1-12 cylinder engines
- Internal Shift Light: Yes
- Mount Style: Dash Mount
- Included: Mounting spin ring, 3 ft Power & Lighting Harness, 8 ft Tachometer Harness
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) hole, carefully drill one at the chosen location.
- Wiring Connection: Connect the 8 ft Tachometer Harness to the output signal from your vehicle’s ignition system (typically the negative side of the coil or equivalent tach signal source), then to the tachometer.
- Power Connection: Connect the 3 ft Power & Lighting Harness to a 12V ignition-switched power source and ground, then to the tachometer.
- Mounting the Gauge: Insert the tachometer into the hole from the front of the dashboard.
- Securing the Gauge: Use the included mounting spin ring to secure the tachometer from the back of the dashboard.
- Calibration (if needed): Calibrate based on the number of engine cylinders. Refer to the product documentation for setting the pulses per revolution (PPR).
- Shift Light Adjustment (if desired): Set the RPM for shift light activation, if supported. Refer to the manual for instructions.
- Testing: Start the vehicle to verify accurate RPM readings and proper shift light function.
BENEFITS OF USING THE SPEEDHUT 4-1/2″ 10K RPM SHIFTLIGHT DASH MOUNT TACHOMETER (R45-TC4-REV):
- Delivers precise and immediate feedback on engine RPM for better performance and control.
- Enhances gear shifting precision with the built-in shift light.
- Helps improve acceleration and fuel efficiency while reducing engine strain.
- Supports long-term engine health by helping avoid over-revving.
- Easy installation and wide compatibility make it suitable for many vehicle types.
FEATURES:
- Displays engine speed up to 10,000 revolutions per minute.
- Incorporates a bright internal light that signals the optimal shift point.
- Designed to interface directly with standard spark plug ignition systems.
- Adaptable for use with engines having between one and twelve cylinders.
- Sized at 4 1/2 inches for prominent yet manageable dashboard integration.
- Requires a 4.250-inch opening for secure and seamless mounting.
- Allows for user-defined pulse settings to match various engine configurations.
- Engineered for precise needle movement, ensuring accurate readings during dynamic driving conditions.
- Functions effectively with any gasoline engine producing a tachometer signal exceeding one volt.





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