KOSO BA015000 RX-2NR GP Style Tachometer User Manual

1. Introduction

This manual provides detailed instructions for the installation, setup, operation, and maintenance of your KOSO BA015000 RX-2NR GP Style Tachometer. This advanced gauge is designed to provide critical engine information, including RPM, programmable shift light, temperature output, and maximum RPM record, ensuring optimal performance monitoring for your vehicle.

2. Safety Information

Always observe the following safety precautions during installation and operation:

• Ensure the vehicle's power is disconnected before beginning any electrical work to prevent short circuits or electrical shock.
• Wear appropriate safety gear, including eye protection, during installation.
• Verify all wiring connections are secure and properly insulated to prevent damage to the unit or vehicle's electrical system.
• Do not attempt to modify the tachometer unit. Unauthorized modifications can void the warranty and lead to malfunction.
• Consult a qualified technician if you are unsure about any installation steps.

3. Package Contents

Carefully unpack the box and ensure all items listed below are present. If any items are missing or damaged, please contact your dealer.

Figure 3.1: Contents of the KOSO RX-2NR Tachometer kit, including the main unit, wiring harness, mounting hardware, and temperature sensor.

• KOSO RX-2NR GP Style Tachometer Unit
• Main Wiring Harness
• Mounting Bracket and Hardware (screws, nuts, washers)
• Temperature Sensor
• Cable Ties
• Instruction Manual (this document)
• KOSO Sticker

4. Installation

Follow these general steps for installing your KOSO RX-2NR Tachometer. Specific vehicle requirements may vary.

4.1 Mounting the Unit

Select a suitable location on your vehicle's dashboard or handlebar that provides clear visibility and does not obstruct your view or controls. Use the provided mounting bracket and hardware to securely fasten the tachometer.

Figure 4.1: Technical drawing showing the dimensions of the KOSO RX-2NR Tachometer unit for precise mounting.

4.2 Wiring Connections

1. Power Supply: Connect the positive power wire (typically red) from the tachometer harness to a switched 12V DC power source on your vehicle. Ensure this connection is made to a fused circuit to protect the unit and vehicle's electrical system.
2. Ground: Connect the ground wire (typically black) to a reliable chassis ground point on your vehicle.
3. RPM Signal: Connect the RPM signal wire (refer to your vehicle's service manual for specific wire color) to the positive side of the ignition coil. For some vehicles, connecting to the negative side or a dedicated ECU RPM output may be required.
4. Temperature Sensor: Install the temperature sensor in the designated location (e.g., coolant hose) and connect its wire to the tachometer harness.
5. Other Signals: Connect any additional signal wires (e.g., neutral light, turn signals) as per the detailed wiring diagram provided with your unit.

After all connections are made, secure any loose wiring with cable ties and ensure no wires are pinched or exposed to moving parts or excessive heat.

5. Setup and Programming

Once installed, the tachometer requires initial setup to match your vehicle's engine configuration. Refer to the detailed instructions included with your unit for specific menu navigation.

Figure 5.1: The KOSO RX-2NR Tachometer displaying RPM on the analog dial and temperature on the digital screen.

5.1 Engine Cylinder Setting

It is crucial to correctly set the number of engine cylinders for accurate RPM readings. Access the setup menu and adjust this parameter according to your vehicle's engine type. For some multi-cylinder engines, selecting a lower cylinder count (e.g., '1' for a 2-cylinder engine) might be necessary to achieve correct RPM display.

5.2 Programmable Shift Light

The RX-2NR features a programmable shift light to indicate optimal shift points. Navigate to the shift light settings in the menu to set your desired RPM thresholds for the warning light activation.

5.3 Temperature Unit Setting

You can select your preferred temperature unit (Celsius or Fahrenheit) through the setup menu.

6. Operating Instructions

The KOSO RX-2NR Tachometer provides real-time engine data through its analog dial and digital display.

6.1 Reading RPM

The large 80mm analog needle indicates engine RPM, allowing for quick and easy monitoring at high speeds. The digital display may also show RPM or other selected parameters.

6.2 Digital Display Functions

The digital display cycles through various functions, including:

• Temperature: Shows the current engine temperature.
• Max RPM Record: Displays the highest RPM achieved during operation. This can be reset through the menu.
• Other Indicators: May include gear position (if connected), warning lights, etc.

6.3 Shift Light Operation

When engine RPM reaches the first programmed threshold, the shift light will illuminate. At the second, higher threshold, it may flash or change color, indicating the optimal time to shift gears.

7. Maintenance

The KOSO RX-2NR Tachometer is designed for durability and requires minimal maintenance.

• Cleaning: Use a soft, damp cloth to clean the display and unit housing. Avoid abrasive cleaners or solvents that could damage the plastic or finish.
• Inspection: Periodically check all wiring connections for security and signs of wear or corrosion.
• Environmental Protection: While designed for vehicle use, avoid prolonged exposure to extreme weather conditions when possible.

8. Troubleshooting

If you encounter issues with your tachometer, refer to the following common problems and solutions:

If the problem persists after attempting these solutions, please contact KOSO customer support or your authorized dealer for further assistance.

9. Specifications

10. Warranty and Support

For warranty information and technical support, please refer to the warranty card included with your product or visit the official KOSO website. You may also contact your authorized KOSO dealer for assistance.