How to Install a Tacho: A Step-by-Step Guide

How To Install A Tacho

If you own a vehicle, you may have heard of a tacho or tachometer. A tacho is a device that measures the rotational speed of an engine’s crankshaft, which is typically displayed in RPM (revolutions per minute). It’s an essential tool for anyone who wants to monitor the health of their engine and ensure it’s running efficiently.

However, installing a tacho can be a daunting task, especially if you’re not familiar with automotive electronics. In this article, we’ll provide you with a step-by-step guide on how to install a tacho and ensure it’s accurate and reliable.

Gather Materials

Before installing a tacho, make sure to carefully read the instructions.
Before installing a tacho, make sure to carefully read the instructions.

Before you start installing a tacho, you’ll need to gather all the necessary materials. These include:

  • Tacho: This is the most important component of the installation process. Make sure you purchase a tacho that’s compatible with your vehicle’s make and model.
  • Wiring harness: A wiring harness is a set of wires that connect the tacho to the vehicle’s electrical system. Make sure you purchase a wiring harness that’s compatible with your vehicle’s make and model.
  • Crimping tool: This tool is used to crimp the wires to the connectors. Make sure you purchase a crimping tool that’s suitable for the wire gauge you’re working with.
  • Electrical tape: Electrical tape is used to secure the wires and prevent them from coming loose.
  • Wire strippers: Wire strippers are used to remove the insulation from the wires.
  • Screwdriver set: You’ll need a set of screwdrivers to remove the dashboard and access the wiring.

It’s essential to ensure that you have all the necessary materials before you start the installation process. Missing a single component can significantly delay the installation process and lead to inaccurate readings.


Once you have all the necessary materials, you’ll need to prepare for the installation process. Here are the steps you need to follow:

  1. Read the instructions: Before you start, make sure you read the instructions that come with the tacho and wiring harness. This will give you an idea of what to expect and help you avoid any mistakes.

  2. Identify the installation location: The tacho should be installed in a location that’s easy to read while driving. The most common location is the dashboard, but you can also install it on the steering column or A-pillar.

  3. Disconnect the battery: Before you start the installation process, make sure you disconnect the battery to avoid any electrical hazards.

  4. Remove the dashboard: Depending on where you’re installing the tacho, you may need to remove the dashboard to access the wiring. Use a screwdriver set to remove the screws and gently pry the dashboard away from the vehicle.

By following these steps, you’ll be ready to start the installation process and ensure that it’s smooth and successful.

Preparation cont.

  1. Identify the wiring: Once you have access to the wiring, you’ll need to identify the wires that connect to the tachometer. These wires are typically color-coded, so refer to the instructions to identify the correct wires.

  2. Connect the wiring: Once you’ve identified the correct wires, you’ll need to connect them to the wiring harness. Use a crimping tool to crimp the wires to the connectors, and use electrical tape to secure the connections.

  3. Test the wiring: Before you install the tachometer, test the wiring to ensure that it’s working correctly. Reconnect the battery and turn on the ignition to see if the tachometer registers any RPM readings.


Once you’ve prepared for the installation process, it’s time to install the tachometer. Here’s a step-by-step guide to installing a tachometer:

  1. Install the tachometer: Install the tachometer in the location you identified during the preparation process. Use a screwdriver set to secure the tachometer in place.

  2. Connect the wiring: Once the tachometer is installed, connect the wiring harness to the tachometer. Make sure you connect the wires to the correct terminals.

  3. Test the tachometer: After connecting the wiring, test the tachometer to ensure that it’s working correctly. Turn on the ignition and check if the tachometer registers any RPM readings.

  4. Calibrate the tachometer: If the tachometer is not reading accurately, you’ll need to calibrate it. Follow the instructions to adjust the tachometer’s settings until it’s reading accurately.

It’s essential to ensure that the installation process is accurate and reliable. Any mistakes can lead to inaccurate readings and potentially damage your engine. By following these steps, you can ensure that the tachometer is installed correctly and functioning accurately.


Once you’ve completed the installation process, it’s essential to test the tacho to ensure that it’s working correctly. Here’s a checklist that you can use:

  1. Turn on the engine: Start the engine and let it idle. The tacho should read the engine’s idle RPM.

  2. Rev the engine: Rev the engine to different RPM levels and check if the tacho is displaying accurate readings.

  3. Test the lighting: If your tacho has a backlight or LED lighting, test it to ensure that it’s working correctly.

  4. Check for accuracy: Use a separate device to confirm the tacho’s readings. The readings should be consistent and accurate.

It’s crucial to test the tacho before using it to monitor the engine’s RPM. Testing ensures that the tacho is working correctly and provides accurate readings.


Even after thorough testing, you may encounter issues with your tacho. Here are some common issues and solutions:

  1. Inaccurate readings: If your tacho is displaying inaccurate readings, check the wiring connections. Loose or damaged connections can cause the tacho to display inaccurate readings.

  2. No readings: If your tacho isn’t displaying any readings, check the wiring connections and ensure that the tacho’s power supply is working correctly.

  3. Flickering readings: If your tacho is displaying flickering readings, it could be due to a loose or damaged wiring connection.

If you’re unable to troubleshoot the issue, it’s essential to seek professional help. A professional mechanic or electronics technician can diagnose and repair the issue, ensuring that your tacho is working correctly.

In conclusion, installing a tacho is a relatively straightforward process that can be completed with the right materials and preparation. By following the steps outlined in this article, you can ensure that your tacho is accurate and reliable. Remember to test the tacho before using it and seek professional help if you encounter any issues. With a working tacho, you can monitor your engine’s RPM and ensure that it’s running efficiently.

Dayne Williamson

I'm Dayne Williamson, and I love all things technology and finance. I started Napo News Online as a way to keep people up-to-date on the latest news in those industries, and I've loved every minute of it. I'm always looking for new ways to improve my site and help my readers, and I can't wait to see what the future holds.

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