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KOSO Manuals & User Guides

KOSO manufactures high-performance aftermarket electronic gauges, LED lighting, and engine components for motorcycles, scooters, and powersports vehicles.

Tip: include the full model number printed on your KOSO label for the best match.

About KOSO manuals on Manuals.plus

KOSO is a premier manufacturer in the powersports aftermarket industry, best known for its high-quality digital instrumentation and electronic accessories. The brand specializes in developing precise monitoring systems, including multifunction speedometers, tachometers, EGT (Exhaust Gas Temperature) gauges, and air/fuel ratio meters, designed to enhance the riding experience for motorcycle, scooter, and ATV enthusiasts.

KOSO's product lineup also includes performance engine parts such as high-flow oil pumps, camshafts, and transmission components. With a slogan of "Feel The Speed," KOSO designs plug-and-play solutions for popular vehicle makes like Harley-Davidson, Honda, and Yamaha, offering riders both aesthetic upgrades and critical performance data. Their instruments are engineered for durability and accuracy, often featuring customizable displays and warning parameters to suit competitive racing or daily commuting needs.

KOSO manuals

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KOSO NF623000 High Flow Oil Pump Instruksyon

Hunyo 20, 2024
KOSO NF623000 High Flow Oil Pump Product Usage Instructions Installation: Before starting the installation process, carefully read the instructions provided in the manual. Follow the steps described to ensure proper…

KOSO v2024 Dual EGT Gauge Instruksyon

Hunyo 6, 2024
KOSO v2024 Dual EGT Gauge Salamat sa pagpalitasing our product. Before installing/operating the product, read the instructions carefully and retain them for future reference. Attention! For installation, follow the…

Koso wh640mm000-MSX Performance Camshaft Instruksyon

Mayo 19, 2024
Koso wh640mm000-MSX Performance Camshaft Salamat sa pagpalitasing our product. Before installing/operating the product, read the instructions carefully and retain them for future reference. NOTICE Correct tools must be used…

KOSO RX-4 Multifunction TFT Meter Instruksyon

Abril 14, 2023
KOSO RX-4 Multifunction TFT Meter Instructions Thank you for purchasing our product. Before installing/operating the product, read the instructions carefully and retain them for future reference. Attention!  For installation, follow…

KOSO 10032697 eBike Heated Grips Instruksyon

Oktubre 10, 2022
KOSO 10032697 eBike Heated Grips Salamat sa pagpalitasing our product. Before installing/operating the product, read the instructions carefully and retain them for future reference. Attention! For installation, follow the…

KOSO D2 Multifunction Meter Instruksyon

Agosto 12, 2022
Mga Instruksyon sa D2 Multifunction Meter Salamat sa pagpalitasing our product. This product is a multifunction meter and is easy to install. Before using, read the instructions carefully and retain them…

Koso RX2N GP Style Multifunction Meter User Manual

manwal sa paggamit
This manual provides detailed instructions for the installation, setup, and operation of the Koso RX2N GP Style Multifunction Meter. It covers features such as tachometer, speedometer, temperature gauges, timers, and…

KOSO Heated Grips Installation and Operation Manual

manwal sa pagtudlo
Comprehensive instruction manual for KOSO heated grips, covering installation, specifications, function settings, low-voltage mode, and troubleshooting. Ensure safe and proper use of your KOSO heated grips.

KOSO HD-03L Gauge Kit Installation and Operation Manual

Manwal sa Instruksyon
This manual provides detailed instructions for installing, operating, and configuring the KOSO HD-03L 4-piece gauge kit for Harley Davidson motorcycles. It covers accessories, disassembly, wiring, gauge overview, mga setting, ug pag-troubleshoot.

KOSO manuals from online retailers

KOSO D75 Speedometer Instruction Manual

KO-BA035171 • May 21, 2026
Instruction manual for the KOSO D75 speedometer, covering setup, operation, maintenance, troubleshooting, and specifications for models measuring 0-140 KM/H or MP/H with a black and chrome edge.

Koso HD-01R GP Style Tachometer User Manual

HD-01R • April 26, 2026
Comprehensive user manual for the Koso HD-01R GP Style Tachometer. Includes setup, operation, maintenance, and specifications for this universal 2- and 4-stroke motorcycle tachometer with water temperature display.

Koso DL-03SR GP Style Multifunction Speedometer User Manual

BB642W10 • April 5, 2026
This manual provides detailed instructions for the Koso DL-03SR GP Style Multifunction Speedometer. Learn about its features, installation, operation, and maintenance for optimal performance. The large display, indicator…

Koso BA004068 Air/Fuel Ratio Meter User Manual

BA004068 • March 29, 2026
Comprehensive user manual for the Koso BA004068 Air/Fuel Ratio Meter, providing detailed instructions for installation, operation, maintenance, and troubleshooting for 2 and 4 stroke engines.

KOSO RX2N Digital Motorcycle Gauge User Manual

MQ905-W • October 16, 2025
Comprehensive user manual for the KOSO RX2N LCD Digital Motorcycle Odometer Speedometer and Fuel Meter (Model MQ905-W), including setup, operation, specifications, and troubleshooting.

KOSO video guides

Tan-awa ang pag-setup, pag-install, ug pag-troubleshoot nga mga video alang niini nga brand.

KOSO support FAQ

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  • Can I disassemble my KOSO gauge for maintenance?

    No. Opening or disassembling the unit yourself will void the warranty. Maintenance and repairs should only be executed by KOSO professionals.

  • What should I check if my KOSO gauge does not power on?

    First, ensure the wiring includes a solid ground and that the 12V power supply is connected. Check if the battery voltage is sufficient (at least DC 12V) and inspect the fuse and wiring harness for breaks.

  • How do I connect the Zenith LED Headlight wires?

    For the KOSO Zenith LED headlight, connect the Yellow wire to the Low beam, the Blue wire to the High beam, the White wire to the Front Position Light, and the Black wire to the vehicle body or engine ground.

  • What does 'LO RNG' mean on my KOSO digital gauge?

    'LO RNG' indicates that the remaining fuel range is low (typically under 16 km or 10 miles). This is a warning to refuel soon.

  • How do I enter the settings mode on my KOSO meter?

    Generally, you must have the key switched to ON, the engine stop switch OFF, and the meter displaying the Odometer. Then, hold both turn signal switches (or the specified button combination for your model) for 3 seconds to enter settings.