Introduction
The AUTO METER 6855 Ultra-Lite Dual Range Tachometer is designed to provide accurate engine RPM readings. Featuring easy-to-read silver dials and high-contrast orange pointers, this gauge is suitable for various automotive applications. This manual provides essential information for proper installation, operation, and maintenance of your tachometer.
Key Features
- Traditional incandescent lighting illuminates the front of the dial for clear visibility.
- Compatible with 12 and 16 volt electrical systems, making it suitable for most street and race car setups.
- Utilizes Auto Meter’s air-core electric technology for quick and accurate readings, with a needle response time of 0 to full scale in 333 milliseconds.
- Supports 0.5 to 6 pulse ignition signals, compatible with 1-12 cylinder engines using points, electronic, and most 12V high-performance racing ignitions.
- Includes Peak RPM Memory recall function, allowing for one-touch review of the highest RPM achieved. This feature assists in analyzing engine performance, wheel spin, gearing, and gear changes.
What's in the Box
- Auto Meter 6855 Ultra-Lite Dual Range Tachometer
- Mounting hardware (typically included with gauges)
- Wiring harness (if applicable)
Note: Please inspect all components upon receipt. Contact customer support if any parts are missing or damaged.
Setup and Installation
Safety First: Disconnect the vehicle's battery before beginning any electrical installation to prevent electrical shorts or damage to the vehicle's electrical system or the tachometer.
- Mounting:
Select a suitable location for the tachometer that provides clear visibility and does not obstruct the driver's view or vehicle controls. Securely mount the tachometer using the provided hardware. Ensure the mounting surface is stable and can support the gauge.
Image: Front view of the Auto Meter 6855 Ultra-Lite Tachometer, showing the dial, needle, and control buttons. The gauge is mounted with its bracket.
- Wiring Connections:
Identify the following wires from your tachometer and connect them to the corresponding vehicle circuits:
- Red Wire (12V Switched Power): Connect to a switched 12-volt power source that is active when the ignition is on. This can typically be found at the fuse box or an accessory circuit.
- Black Wire (Ground): Connect to a clean, chassis ground point. Ensure a good metal-to-metal connection.
- Green Wire (Ignition Signal): Connect to the negative side of the ignition coil or a dedicated tachometer output from your ignition system. Consult your vehicle's service manual for the correct tachometer signal wire location. For some electronic ignition systems, a tach adapter may be required (sold separately).
- White Wire (Illumination): Connect to the vehicle's dash lighting circuit. This will illuminate the tachometer dial when the headlights are on.
Ensure all connections are secure and properly insulated to prevent short circuits.
- Cylinder Select (if applicable):
Some tachometers require setting the number of cylinders. Refer to the specific instructions included with your tachometer for details on how to set this, usually via dip switches or a programming button. The 6855 model is compatible with 1-12 cylinder engines, supporting 0.5-6 pulse ignition signals.
- Final Check:
Once all connections are made, reconnect the vehicle's battery. Turn the ignition to the "ON" position and verify that the tachometer powers on and the needle moves. Start the engine and check for accurate RPM readings. Test the illumination by turning on the vehicle's headlights.
Operating Instructions
The Auto Meter 6855 tachometer provides real-time RPM display and a Peak RPM Memory recall function.
Image: Close-up view of the Auto Meter 6855 tachometer, highlighting the 'ERASE', 'RECALL', and 'SET' buttons on the right side of the dial.
- Reading RPM: The large needle indicates the current engine revolutions per minute (RPM). The dial is marked in thousands of RPM.
- Peak RPM Memory Recall:
- To Record Peak RPM: The tachometer automatically records the highest RPM reached during operation.
- To Recall Peak RPM: Press the RECALL button. The needle will move to display the highest RPM recorded.
- To Erase Peak RPM: While the peak RPM is being displayed (after pressing RECALL), press the ERASE button. This will clear the memory and allow a new peak RPM to be recorded.
- SET Button: This button is typically used for initial setup or advanced programming, if applicable. Refer to the detailed manual for specific functions related to the SET button.
Maintenance
The Auto Meter 6855 tachometer is designed for durability and requires minimal maintenance.
- Cleaning: Use a soft, damp cloth to clean the gauge face and housing. Avoid abrasive cleaners or solvents, as these can damage the plastic lens or finish.
- Wiring Inspection: Periodically check all wiring connections for tightness and signs of wear or corrosion. Ensure insulation is intact.
- Environmental Protection: While designed for automotive environments, avoid exposing the gauge to extreme moisture or direct water spray.
Troubleshooting
If you encounter issues with your tachometer, review the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Tachometer does not power on or illuminate. | No power to red wire, poor ground connection, blown fuse, or faulty illumination wire. | Check 12V switched power connection, ensure ground is secure, inspect vehicle fuses, and verify illumination wire connection. |
| Tachometer needle does not move or shows incorrect RPM. | Incorrect ignition signal connection, faulty signal wire, incorrect cylinder setting, or ignition system incompatibility. | Verify green wire connection to the correct ignition signal source. Ensure cylinder setting is accurate. Consider if a tach adapter is needed for your ignition system. |
| Needle is erratic or jumps. | Poor ground connection, electrical interference, or loose signal wire. | Ensure a solid ground connection. Route signal wire away from high-voltage wires. Check all connections for tightness. |
If these steps do not resolve the issue, contact Auto Meter customer support for further assistance.
Specifications
| Specification | Detail |
|---|---|
| Brand | AUTO METER |
| Model Number | 6855 |
| Material | Plastic |
| Item Dimensions (L x W x H) | 7 x 8 x 7 inches |
| Voltage Compatibility | 12V and 16V |
| Ignition Signal Compatibility | 0.5 - 6 pulse (1-12 cylinder engines) |
| Response Time | 0 - full scale in 333 milliseconds |
| Lighting | Traditional incandescent |
Warranty Information
The Auto Meter 6855 Ultra-Lite Dual Range Tachometer comes with a 1-year limited warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from improper installation, misuse, accident, or unauthorized repairs.
For warranty claims or detailed warranty terms, please refer to the official Auto Meter warranty documentation or visit their official website.
Support and Contact
For technical assistance, replacement parts, or further information regarding your Auto Meter 6855 tachometer, please visit the official Auto Meter website or contact their customer support department.
Official Website: www.autometer.com
Note: Product specifications and features are subject to change without notice. Always refer to the latest documentation provided by the manufacturer.
