1. Introduktion
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. Sikkerhedsoplysninger
Overhold altid følgende sikkerhedsforanstaltninger under installation og drift:
- Ensure the vehicle's power is disconnected before beginning any electrical work to prevent short circuits or electrical shock.
- Brug passende sikkerhedsudstyr, herunder øjenbeskyttelse, under installationen.
- 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.
- Kontakt en kvalificeret tekniker, hvis du er usikker på nogen af installationstrinnene.
3. Pakkens indhold
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
- Hovedledningsnet
- Mounting Bracket and Hardware (screws, nuts, washers)
- Temperatursensor
- Kabelbindere
- Instruktionsmanual (dette dokument)
- KOSO Sticker
4. Installation
Follow these general steps for installing your KOSO RX-2NR Tachometer. Specific vehicle requirements may vary.
4.1 Montering af enheden
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 Ledningsforbindelser
- Strømforsyning: 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.
- Jord: Connect the ground wire (typically black) to a reliable chassis ground point on your vehicle.
- 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.
- Temperatursensor: Install the temperature sensor in the designated location (e.g., coolant hose) and connect its wire to the tachometer harness.
- Andre signaler: 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. Opsætning og programmering
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 Indstilling af temperaturenhed
You can select your preferred temperature unit (Celsius or Fahrenheit) through the setup menu.
6. Betjeningsvejledning
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 Digitale displayfunktioner
The digital display cycles through various functions, including:
- Temperatur: 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. Vedligeholdelse
The KOSO RX-2NR Tachometer is designed for durability and requires minimal maintenance.
- Rensning: Brug en blød, damp cloth to clean the display and unit housing. Avoid abrasive cleaners or solvents that could damage the plastic or finish.
- Inspektion: Periodically check all wiring connections for security and signs of wear or corrosion.
- Miljøbeskyttelse: While designed for vehicle use, avoid prolonged exposure to extreme weather conditions when possible.
8. Fejlfinding
If you encounter issues with your tachometer, refer to the following common problems and solutions:
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Ingen strøm/skærm slukket | Løs strømforbindelse, sprunget sikring, forkert ledningsføring. | Check power and ground connections. Inspect vehicle fuse. Verify wiring against diagram. |
| Incorrect RPM reading | Incorrect cylinder setting, poor RPM signal connection. | Adjust cylinder setting in the menu. Ensure RPM signal wire is securely connected to the correct source (e.g., positive side of coil). |
| Jumpy or erratic needle | Electrical interference, poor ground connection, faulty RPM signal. | Ensure all wiring is properly shielded and routed away from ignition components. Verify ground connection. Re-check RPM signal source. |
| Temperature not displayed or incorrect | Temperature sensor not connected, faulty sensor, incorrect unit setting. | Check temperature sensor connection. Verify sensor is properly installed. Confirm temperature unit setting in menu. |
| Shift light not working | Shift light RPM thresholds not set, unit malfunction. | Program the shift light RPM thresholds in the setup menu. |
If the problem persists after attempting these solutions, please contact KOSO customer support or your authorized dealer for further assistance.
9. Specifikationer
| Feature | Specifikation |
|---|---|
| Modelnummer | BA015000 |
| Display Type | Analog (RPM) and Digital (Multi-function) |
| RPM-rækkevidde | Op til 16,000 RPM |
| Funktioner | RPM, Programmable Shift Light, Temperature, Max RPM Record |
| Strømindgang | DC 12V |
| Produktmål (L x B x H) | 5 x 5 x 5 tommer (ca.) |
| Varens vægt | 1.5 pund (omtrentligt) |
| Producentens varenummer | BA015000 |
10. Garanti og 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.





