Digital Tach Hour Meter & Temperature Gauge User Manual

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your Runleader HM035A Multifunctional Meter. This device combines a digital tachometer, hour meter, and temperature gauge, designed for various small engines.

Note: This product may be shipped as HM035Z or HM035A. Both models have identical functions; only the model name and battery installation methods differ.

The meter features a backlit display and is suitable for a wide range of applications including motorcycles, lawn tractors, generators, dump trucks, ATVs, chainsaws, go-karts, snow plows, outboard motors, and road machinery.

2. Key Features

• Engine Temperature Monitoring: Measures engine temperature from -20℃ to +300℃ (-4℉ to +572℉). Units can be switched between ℃ and ℉. Features over-temperature alerts and resettable maximum temperature records.
• Multifunction Hour Meter: Tracks Total Hours (TOT) and a resettable Partial Timer (JOB) up to 99999 hours. Timing accuracy is 0.1H for 0.0-9999.9H and 1H for values exceeding 9999.9H. Includes a selectable maintenance reminder (SVC) from 5-1000H or OFF.
• Tachometer: Monitors real-time RPM from 0-25000 RPM. Features 9 programmable engine firing patterns for accurate monitoring, resettable maximum RPM records, and overspeed alerts.
• Multi-Screen Display: Allows simultaneous display of clock, RPM, timer, temperature, and other functions for easy reading.
• Additional Features: Three installation methods (Velcro, Screw, Aluminum bracket), backlight display (Auto/ON/OFF), replaceable CR2032 battery, IP67 waterproof rating, user shutdown function, and records engine work times.

3. Product Components

The package includes the following items:

1. Multifunctional Meter (x1)
2. Cable tie (x2)
3. TEMP sensor PT100 (x1)
4. 3M adhesive velcro (x1)
5. Bolt (x2)
6. Nut (x4)
7. Flat washer (x2)
8. Battery CR2032 (x1)
9. Cut-out label (x1)
10. User manual (x1)
11. Runleader color box (x1)

4. Installation

4.1 Mounting the Meter

The meter offers three primary installation methods:

1. Velcro Installation:
   • Clean the installation surface thoroughly, ensuring it is flat and free of oil or moisture.
   • Paste the hook side of the Velcro to the desired installation position.
   • Paste the fluffy side of the Velcro to the back of the meter.
   • Attach the meter to the hook side of the Velcro and press firmly.
   • Ensure the chosen position is free from moisture, grease, violent vibration, and temperatures exceeding 125°F (51.7°C).
2. Screw Installation:
   • Fasten the two M3 bolts onto the hour meter.
   • Mount the bolts into the pre-drilled holes on your fixed plate.
   • Secure with M3 gaskets and screw nuts.
   • If your mounting plate does not have matching holes, you will need to drill them.
3. Aluminum Bracket Installation (Bracket not included):
   • Fasten the aluminum bracket to your mounting plate using M6 screws.
   • Secure the hour meter to the aluminum bracket using M3 screws.

4.2 Signal Wire Connection (Spark Plug)

The signal wire (yellow) is crucial for RPM and hour tracking. Its length is approximately 620mm (24.4 inches).

• For Traditional Ignition Modes: Wrap the signal wire 4 to 5 turns tightly around the engine spark plug wire.
• For "Pencil Coil" Ignition: Wrap the signal wire around the plastic coil located above the spark plug.
• Secure the wrapped wire with a cable tie to prevent loosening.
• Important: If the connection is not strong, the tachometer may receive insufficient signal, leading to inaccurate RPM and hour readings. Adjust the number of windings (increase for low RPM, decrease for high RPM) to optimize signal acquisition for different engine types.

4.3 Temperature Sensor Connection

The temperature sensor (PT100) cable length is approximately 650mm (25.5 inches). Connect the temperature sensor to the meter. If the sensor is not connected, the display will show "ERR" flashing.

The temperature sensor has an inner ring diameter of 14mm for mounting.

5. Operation

The meter has two buttons: 'M' (Mode) and 'S' (Set/Select).

5.1 Power On/Off

• Power On: Press either the 'M' or 'S' button to power on the device.
• Power Off: Press and hold both 'M' and 'S' buttons simultaneously for 3 seconds until "OFF" is displayed. The LCD will shut down. It will power on automatically if an engine signal is detected or if 'M' or 'S' is pressed again.

5.2 Navigating Display Interfaces

Press the 'M' button to switch between the 7 main display interfaces:

• Interface 1: TOT (Total Hours) / Temperature / Clock / Battery indicator
• Interface 2: JOB (Partial Timer) / MAX TEMP / MAX RPM / Battery indicator
• Interface 3: SVC (Maintenance Reminder) / Alert TEMP / Alert RPM / Battery indicator
• Interface 4: RPM measurement range / Battery indicator
• Interface 5: Engine firing patterns / Battery indicator
• Interface 6: Engine start count / Battery indicator
• Interface 7: Backlight mode / Battery indicator

5.3 Setting Parameters

To enter the setting interface, press and hold the 'S' button from any display interface.

5.3.1 Clock Setting (24-hour format)

1. Press and hold 'S' to enter setting mode. The hour value will flash.
2. Press 'S' to adjust the hour.
3. Press 'M' to switch to minute setting. The minute value will flash.
4. Press 'S' to adjust the minute.
5. Release buttons and wait 10 seconds, or press and hold 'M' and 'S' for 2 seconds to save and exit.

5.3.2 Total Hours (TOT)

• TOT is always displayed and cannot be reset.
• Max value is 99999 hours. It restarts from 0 after exceeding this value.
• Initial time setting: To program a starting hour value (e.g., from an old timer), enter setting mode (hold 'S'), press 'M' twice until "0000.0" flashes. Hold 'S' to switch position, press 'S' to set value. Save and exit as above. This can only be set once and will not be resettable after 1 hour of engine operation.

5.3.3 Job Timer (JOB)

• To view JOB time: Press 'M' once from the main display.
• To reset JOB time: Enter setting mode (hold 'S'), press 'M' three times until "JOB" flashes. Hold 'S' until "0000.0" flashes to reset.

5.3.4 Maintenance Reminder (SVC)

• To program SVC time: Enter setting mode (hold 'S'), press 'M' four times until the SVC time value flashes. Press 'S' to set the desired value (range OFF/5-1000H). Save and exit as above.
• When the SVC interval is reached, the LCD and backlight will flash red. Press 'S' or 'M' to clear the status and start the next interval.

5.3.5 Alert RPM

• To program Alert RPM: Enter setting mode (hold 'S'), press 'M' five times until the Alert RPM value flashes. Press 'S' to adjust the value (increments of 100, hold for 1000). Set to "OFF" to disable. Save and exit as above.
• If engine RPM exceeds the set value, the RPM and warning icon will flash, and the backlight will turn red.

5.3.6 Max RPM

• To view Max RPM: Navigate to display interface 2 using the 'M' button.
• To reset Max RPM: Enter setting mode (hold 'S'), press 'M' six times until the Max RPM value flashes. Hold 'S' until "00000" flashes to reset.

5.3.7 RPM Measurement Range

• To select RPM range: Enter setting mode (hold 'S'), press 'M' seven times until the RPM measurement range flashes. Press 'S' to select the desired range (r1: 0-25000 RPM, r2: 0-18000 RPM, r3: 0-12000 RPM, r4: 0-6000 RPM). Save and exit as above.
• Selecting the correct range improves accuracy and anti-jamming performance.

5.3.8 Programmable Firing Patterns (Engine Type Settings)

• To set firing pattern: Enter setting mode (hold 'S'), press 'M' eight times until "1P1r" flashes. Press 'S' to select the desired stroke mode. Save and exit as above.
• Default setting is 1P1R. Available patterns: 1P1R, 1P2R, 2P1R, 3P1R, 3P2R, 4P1R, 5P2R, 6P1R, 8P1R.
• Refer to the table below for engine type compatibility.

5.3.9 Over-Temperature Alert

• To set alert value: Enter setting mode (hold 'S'), press 'M' nine times until the temperature alert value flashes. Press 'S' to adjust the value (range -20°C to +300°C / -4°F to +572°F). Save and exit as above.
• If measured temperature exceeds the set value, the alert icon and backlight will flash red.

5.3.10 Temperature Unit Selection

• To select unit: Enter setting mode (hold 'S'), press 'M' ten times until the temperature unit flashes. Press 'S' to select °C or °F. Save and exit as above.

5.3.11 Reset Max Temperature

• To reset: Enter setting mode (hold 'S'), press 'M' eleven times until the maximum temperature value flashes. Hold 'S' until "-" is displayed. Save and exit as above.
• The maximum temperature will reset to -20°C (-4°F). The recorded maximum temperature updates if the current temperature exceeds the recorded value by a factor of 2.

5.3.12 Backlight Choice

• To select backlight mode: Enter setting mode (hold 'S'), press 'M' twelve times until "Auto" flashes. Press 'S' to select Auto, ON, or OFF. Save and exit as above.

5.3.13 Engine Start Count

• To view: Navigate to display interface 6 using the 'M' button. The number at the bottom of the screen indicates the engine start count.

6. Maintenance

6.1 Battery Replacement

When the battery icon on the display screen starts to flash, it indicates that the battery voltage is very low and a new CR2032 battery needs to be replaced.

To replace the battery:

1. Locate the battery cover on the back of the meter.
2. Use a coin or a small screwdriver to twist open the battery cover.
3. Remove the old CR2032 battery.
4. Insert the new CR2032 battery with the positive (+) side facing up.
5. Replace the battery cover and twist to secure it.
6. If it's a new installation, remember to remove the battery insulator before first use.

6.2 General Care

• The product has a certain waterproof function (IP67), but it should not be used in deep water or soaked in rain for extended periods.
• Use the product within the specified temperature range. High temperatures may cause damage.
• Avoid pulling the wiring to prevent disconnections or poor contact.
• Install the product in a secure location to prevent impacts and damage.

7. Troubleshooting

• "ERR" Flashing on Display: This indicates that the temperature sensor is not connected or is faulty. Ensure the temperature sensor is properly connected to the meter.
• Inaccurate RPM/Hour Readings: This can be caused by an insufficient signal from the spark plug wire. Adjust the number of windings of the signal wire around the spark plug wire (increase for low RPM, decrease for high RPM) to improve signal strength. Ensure the connection is tight and secure with a cable tie.
• Display Not Turning On: Ensure the battery insulator has been removed (for new units) and the CR2032 battery is correctly installed and has sufficient charge. Press 'M' or 'S' to power on.
• Backlight Not Working: Check the backlight settings (Section 5.3.12) to ensure it's not set to OFF.

8. Specifications

9. User Tips

• Diesel Engine Connection: For diesel engines, the connection method for RPM sensing might differ from gasoline engines. Typically, diesel engines do not have spark plugs. You may need to connect the signal wire to the alternator's 'W' terminal or use an inductive pickup on the fuel injector line, if available and compatible. Consult a diesel engine specialist or the engine's specific manual for precise connection points.
• Motorcycle Specific Wiring (e.g., BMW R1200gs): For specific motorcycle models like the BMW R1200gs, the optimal spark plug wire for inductive pickup might vary. It is recommended to test different spark plug wires or consult a motorcycle-specific forum or service manual for the most reliable connection point to ensure accurate RPM readings.

10. Warranty and Support

This product comes with 2 years of after-sales support and technical group assistance. If you encounter any technical issues or product problems, please contact the seller's customer service for assistance.

A detailed user manual in PDF format is available for download: User Manual (PDF)