Speedhut 4" Antique Series 8K RPM Shift-light Tachometer (R4-TC3-ATQ)
The Speedhut 4" Antique Series 8K RPM Shift-light Tachometer (R4-TC3-ATQ) offers precise engine speed monitoring with a classic aesthetic. Designed for vehicles utilizing standard spark plug ignition systems, this 4-inch gauge provides accurate RPM readings up to 8,000. Its integrated shift light enhances performance awareness, allowing drivers to optimize gear changes. Compatible with 1 to 12 cylinder gasoline engines, this tachometer is a valuable addition for anyone seeking reliable engine data in a timeless style.
KEY FEATURES AND BENEFITS:
Provides real-time RPM readings: Up to 8,000, crucial for performance monitoring.
Integrated shift light: Intensely bright internal LEDs improve awareness of optimal shift points.
Calibratable pulse range: From 1/2 pulse to 6 pulses per revolution, ensuring wide compatibility with 1-12 cylinder gas engines.
Accurate pointer movement: Reliable even under demanding engine conditions.
Easy installation: Designed for a 4-inch (100mm) mounting hole.
Includes wiring harnesses: Necessary tachometer signal and power/lighting connections provided.
Classic Antique Series styling: Complements vintage and custom vehicle interiors.
Gauge Type: Tachometer
Tachometer Signal Type: Standard spark plug ignition systems
Compatibility: 1-12 cylinder gasoline engines
Range: 0-8,000 RPM
Size: 4 inches (100mm)
Hole Size: 3.95 inches (100mm)
Internal Shift Light: Yes
8 ft Tachometer Harness (1 Wire 2 Pin Connector)
3 ft Power & Lighting Harness
Mount the Gauge: Locate a suitable flat surface on your vehicle's dashboard and drill a 3.95-inch (100mm) diameter hole. Insert the tachometer and secure it using the included gauge mounting ring.
Connect the Tachometer Harness: Attach the 8 ft Tachometer Harness (1 Wire 2 Pin Connector) to the appropriate tachometer signal output, usually the negative (-) side of the ignition coil or ECU tach output.
Connect the Power and Lighting Harness: Connect the 3 ft harness: red wire to switched 12V ignition power, black wire to ground, and any additional wire to lighting circuit for illumination.
Calibrate if Necessary: Adjust pulses per revolution via switch or setting to match your engine cylinders (consult manual for details).
Test the Gauge: Start the engine and verify accurate RPM readings and that the shift light illuminates at the desired RPM.
BENEFITS OF USING THE SPEEDHUT 4" ANTIQUE SERIES 8K RPM SHIFT-LIGHT TACHOMETER (R4-TC3-ATQ):
Provides accurate, immediate engine speed feedback for optimal vehicle operation.
The integrated shift light aids precise gear changes, enhancing acceleration and preventing engine over-revving.
Classic "Antique Series" styling improves the interior look of vintage or custom vehicles.
Compatible with a wide range of 1 to 12 cylinder gasoline engines using standard ignition systems.
Relatively simple installation with included wiring harnesses.
Displays engine speed up to 8,000 RPM.
Bright internal LEDs function as a visual shift indicator.
Works with standard spark plug ignition signals.
Supports engines with 1, 2, 3, 4, 5, 6, 8, 10, or 12 cylinders.
Requires a 4-inch (100mm) mounting hole.
Includes an 8-foot tachometer signal harness.
Comes with a 3-foot power and illumination harness.
Product identification
- Brand: Speedhut
- Model / MPN: R4-TC3-ATQ




