1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your ELING Universal 85mm Tachometer with LCD Hour Meter. This instrument is designed for precise measurement of engine RPM and tracking engine operating hours. It features a durable design, excellent anti-fogging capabilities, and a multi-color backlight for enhanced visibility.
Important Note: There are different options for sensors and gauges available. Please confirm that the product you received matches the specifications and images in this manual.
2. Product Features
- Waterproof Rating: IP67, ensuring reliable performance in various environmental conditions.
- Anti-fogging Function: Equipped with curved glass for excellent anti-fogging.
- Durable Construction: Features a 316 Stainless steel bezel.
- Easy Installation: Designed for convenient installation using a multi-plug socket connecting method.
- Wide Application: Suitable for various vehicles and vessels including cars, trucks, boats, diesel generator engines, and gasoline engines.
- Backlight: 7 selectable backlight colors (red, green, blue, white, yellow, cyan, purple).
- Hour Meter: Integrated LCD hour meter with a range of 0.0-99999.9 hours.
- Adjustable Speed Ratio: Speed ratio is adjustable from 1.0 to 360.
Figure 1: Various Tachometer Ranges and Backlight Colors
3. Technical Specifications
| Parameter | Value |
|---|---|
| Installation Dimension | 85mm |
| Signal Type | Pulse |
| Indicating Range | 0-3000RPM, 0-4000RPM, 0-6000RPM, 0-7000RPM, 0-8000RPM (depending on model) |
| Working Voltage | 9-32VDC |
| Speed Ratio | 1.0-360 (adjustable) |
| Working Current | ＜120mA |
| Backlight Colors | 7 colors (red, green, blue, white, yellow, cyan, purple) |
| Engine Hours Range | 0.0-99999.9H |
| Working Temperature | -30 to 70℃ |
| Storage Temperature | -40 to 85℃ |
| Waterproof & Dustproof Grade | IP67 |
| Operation Mode | LCD display, stepper motor |
| Material | Stainless steel with plastic |
| Item Weight | 0.5 KG |
| Item Height | 55 MM |
| Item Width | 85 MM |
| Item Length | 85 MM |
Figure 2: Tachometer Dimensions (Bezel Dia: 97mm, Behind the panel: 55mm, Dia: 85mm)
4. Package Contents
The standard package includes the following items:
- 1x Tachometer
- 1x Connection Cable
- 1x Installation Manual (this document)
Figure 3: Package Contents
5. Installation Instructions
Follow these steps for proper installation of your tachometer:
- Prepare the Mounting Hole: Before installation, create a circular hole with a diameter of Φ85mm (3 3/8 inches) in your dashboard or panel. Ensure there is at least 55mm of clear space behind the panel for the tachometer body.
- Insert the Gauge: Carefully insert the tachometer into the prepared hole.
- Secure the Gauge: Use the provided mounting nut and gasket to secure the gauge firmly in place from the backside of the panel.
Figure 4: Installation Diagram
6. Wiring Connections
The tachometer requires specific wiring connections for power, ground, RPM signal, and backlight. Refer to the diagram and descriptions below:
General Connection
- Black Wire: Ground (-)
- Red Wire: 9-32VDC (+) Power Supply
- Blue Wire: RPM Signal Input
- Yellow Wire: Backlight (+)
- White Wire: NC (Not Connected / Reserved)
Figure 5: General Wiring Connections
Sensor Types and Wiring
The tachometer can be used with different types of speed sensors. Ensure you use the correct sensor and wiring method for your engine type.
Figure 6: Various Tacho Sensor Types
Figure 7: Tacho Sensor Installation Diagram
Figure 8: Detailed Wiring and Technical Parameters for Sensors
Two-Wire System (e.g., Magnetoelectric Sensor for Diesel Engine)
- Installation: The sensor is mounted on the engine's flywheel casing, positioned vertically to the top surface of the flywheel gear. The distance (L) between the induction end of the sensor and the flywheel top surface should be ≤1mm. A smaller distance results in a stronger output signal.
- Wire Connection: Both wires are typically black. One connects to the signal output, and the other to Ground (GND). There is no specific direction requirement for the wire connection.
- Technical Parameters:
- Output voltage: Sinusoidal wave
- Measurement range: 100-15000Hz
- Effective voltage (at 360Hz): ≥1.5VAC (multimeter), peak voltage ≥5V (oscilloscope)
- Resistance (at 25℃): 1200Ω±10%
- Gear modules: ≥2
- Protection rank: IP65
- Length: L=100MM L1=80MM
Three-Wire System (e.g., Holzer Sensor for Inboard or Gas Engine)
- Installation: The sensor is mounted on the engine's flywheel casing, positioned vertically to the top surface of the flywheel gear. The distance (L) between the induction end of the sensor and the flywheel top surface should be ≤2mm.
- Wire Connection:
- Red wire: Connect to Vcc (+) (18-32V)
- Blue wire: Connect to Vss (-)
- Black wire: Connect to signal output
- Technical Parameters:
- Working voltage: 18-32V
- Output voltage: Rectangular wave
- High level: >10V
- Low level: <0.7V
- Duty ratio: 50±20%
- Frequency: ≤20KHz
- Protection rank: IP65
- Length: L=80MM L1=70 / L=80MM L1=60MM
7. Operation
The tachometer features a single black button on the backside for configuration.
Speed Ratio Adjustment
The speed ratio (pulse per revolution) needs to be set according to your engine's specifications for accurate RPM readings. The adjustable range is 1-360.
- Enter Setting Mode: Long press the black button on the backside of the tachometer for 3 seconds. The display will show the current speed ratio.
- Adjust Speed Ratio:
- While in setting mode, long press the black button again to increase the speed ratio value.
- Release the button, then long press it again to decrease the speed ratio value.
- Save Setting: Once the desired speed ratio is displayed, release the button. The tachometer will automatically save the new setting after 3 seconds. If the setting is not satisfactory, repeat the process.
- Exit Setting Mode: Release the black button for more than 3 seconds to exit the setting mode.
Video 1: Product demonstration showing different backlight colors and speed ratio adjustment.
Backlight Color Change
The tachometer offers 7 backlight colors. To change the backlight color:
- Short Press: Short press the black button (less than 3 seconds) to cycle through the backlight colors in the following sequence: Red → Green → Blue → White → Yellow → Cyan → Purple.
- Automatic Cycle: After Purple, the next short press will activate the automatic cycle mode, where the backlight color switches every 1 minute.
8. User Tips
No specific user tips were available from reviews or Q&A at this time. For optimal performance, ensure all connections are secure and waterproofed where necessary.
9. Troubleshooting
If you encounter issues with your tachometer, consider the following common problems and solutions:
- No Power/Display:
- Check the Red (+) and Black (-) power connections for proper voltage (9-32VDC) and secure contact.
- Ensure the fuse in the power line (if installed) is not blown.
- Incorrect RPM Reading:
- Verify that the speed ratio is correctly set according to your engine's specifications (refer to Section 7).
- Check the Blue (RPM Signal) wire connection to the sensor and ensure the sensor is properly installed and functioning.
- For two-wire sensors, ensure the distance between the sensor and flywheel gear is ≤1mm. For three-wire sensors, ensure the distance is ≤2mm.
- Inspect the sensor and wiring for any damage or corrosion.
- Backlight Not Working/Changing:
- Check the Yellow (Backlight +) wire connection.
- Ensure the power supply is within the specified voltage range.
- Try short pressing the black button multiple times to cycle through colors and automatic mode.
- Hour Meter Not Advancing:
- Ensure the tachometer is receiving a valid RPM signal, as the hour meter typically relies on engine operation.
If problems persist after checking these points, please contact customer support.
10. Maintenance
To ensure the longevity and optimal performance of your ELING Tachometer, follow these maintenance guidelines:
- Cleaning: Clean the instrument's display and bezel with a soft, damp cloth. Avoid using abrasive cleaners or solvents that could damage the surface or seals.
- Inspection: Periodically inspect all wiring connections for tightness and signs of corrosion or damage. Ensure the sensor is securely mounted and free from debris.
- Waterproofing: Although the instrument is IP67 waterproof, ensure that all cable entries and mounting points are properly sealed during installation to maintain its water resistance, especially in marine environments.
- Environmental Conditions: Avoid exposing the instrument to extreme temperatures outside its specified operating and storage ranges (-30 to 70℃ operating, -40 to 85℃ storage) for extended periods.
11. Warranty and Support
For any questions, technical assistance, or warranty claims, please contact the ELING Outlets Store directly through the platform where you purchased the product. Provide your order details and a clear description of the issue to facilitate prompt support.