1. Introduction and Overview
The Auto Meter 6811 Pro-Comp Memory Tachometer is a precision instrument designed to monitor engine revolutions per minute (RPM) with accuracy and reliability. This tachometer incorporates a memory recall function, allowing users to review peak RPM achieved during operation, which is valuable for performance analysis and tuning.
Figure 1: Front view of the Auto Meter 6811 Pro-Comp Memory Tachometer, showing the dial, needle, and control buttons.
2. Key Features
- Peak RPM Memory Recall: Allows for one-touch review of the highest RPM achieved, aiding in performance diagnostics.
- Wide Compatibility: Operates with 12-volt and 16-volt electrical systems, suitable for various vehicle types.
- Responsive Air-Core Electric Movement: Provides rapid and accurate RPM readings, with the needle capable of moving from 0 to full scale in 333 milliseconds.
- Ignition Signal Versatility: Compatible with 0.5 to 6 pulse ignition signals, supporting 1-12 cylinder engines with points, electronic, and most 12V high-performance racing ignitions.
- Traditional Incandescent Lighting: Ensures clear visibility of the dial in low-light conditions.
3. Installation Guide
Proper installation is crucial for the accurate and safe operation of your tachometer. If you are not experienced with automotive electrical systems, professional installation is recommended.
3.1 Mounting
- Select a suitable location for the 5.000 inch tachometer, ensuring it is visible to the driver and does not obstruct other controls or gauges.
- Securely mount the tachometer using the provided bracket and hardware. Ensure the mounting surface is stable and can support the gauge's weight.
3.2 Wiring Connections
Identify the following wires from your vehicle's electrical system:
- Red Wire (Ignition Switched 12V/16V Power): Connect to a circuit that receives power when the ignition is on. This provides power to the tachometer.
- Black Wire (Ground): Connect to a reliable chassis ground point. Ensure a clean, secure connection for proper operation.
- Green Wire (Ignition Signal): Connect to the negative side of the ignition coil or a dedicated tachometer output from your ignition system. Refer to your vehicle's service manual for the correct ignition signal wire.
- 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 insulated to prevent short circuits.
4. Operating Instructions
4.1 Basic Operation
Once installed and powered, the tachometer needle will display the current engine RPM. The dial is marked in thousands of RPM (x 1000).
4.2 Peak RPM Memory Function
The Pro-Comp Memory Tachometer features a Peak RPM Memory function, often referred to as a "tattle tale," which records the highest RPM reached during a period of operation.
Figure 2: Detail of the control panel with the red ERASE button and yellow RECALL button.
- To Recall Peak RPM: Press the RECALL (yellow) button. The tachometer needle will move to indicate the highest RPM recorded since the last reset.
- To Erase Peak RPM: Press the ERASE (red) button. This will clear the stored peak RPM, allowing a new peak to be recorded.
This feature is particularly useful for analyzing engine performance, identifying optimal shift points, and understanding engine behavior under various conditions.
5. Maintenance
The Auto Meter 6811 Tachometer is designed for durability and requires minimal maintenance.
- Cleaning: Use a soft, damp cloth to clean the exterior of the gauge. Avoid abrasive cleaners or solvents, as these can damage the finish or lens.
- Inspection: Periodically check wiring connections to ensure they remain secure and free from corrosion.
6. Troubleshooting
If you encounter issues with your tachometer, refer to the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Tachometer not working (no needle movement) | No power, poor ground, incorrect ignition signal connection. |
|
| Inaccurate RPM reading | Incorrect ignition signal type, electrical interference, faulty wiring. |
|
| Illumination not working | No power to white illumination wire, burnt bulb. |
|
| Peak RPM memory not functioning | Buttons not pressed correctly, internal fault. |
|
7. Specifications
- Brand: AUTO METER
- Model: 6811
- Type: Pro-Comp Memory Tachometer
- Gauge Size: 5.000 inches
- Material: Plastic
- Dimensions (L x W x H): 3.94 x 3.94 x 3.94 inches
- Item Weight: 1.98 pounds
- Voltage Compatibility: 12V and 16V
- Ignition Signal Compatibility: 0.5 - 6 pulse (1-12 cylinder engines)
- Lighting: Traditional Incandescent
- UPC: 046074068119
- Manufacturer Part Number: 6811
8. Warranty Information
The Auto Meter 6811 Pro-Comp Memory Tachometer is covered by a 1-year limited warranty from the original date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from improper installation, misuse, abuse, accident, or unauthorized repairs.
For warranty claims or service, please retain your proof of purchase and contact Auto Meter customer support through their official website or contact channels.
9. Important Safety Information
CALIFORNIA WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Always exercise caution when working with automotive electrical systems. Disconnect the vehicle's battery before performing any installation or maintenance to prevent electrical shock or damage to components.
10. Customer Support
For further assistance, technical support, or to inquire about replacement parts, please visit the official Auto Meter website or contact their customer service department.
Auto Meter Official Website: www.autometer.com
