Installing Autometer Fuel Pressure Gauge: Step-By-Step Guide

Installing an Auto Meter Fuel Pressure Gauge requires careful attention to safety and technical details. Before starting, it is imperative to disconnect the negative battery cable and ensure the engine is cool. The gauge must be securely mounted, with specific diameter holes drilled for the gauge size, and the wires connected correctly: typically, the white wire to the dash lighting or a 12V source, the red wire to a switched 12V source, and the black wire to ground. The exact process varies depending on the vehicle's specific make and model, with different diameter holes and mounting locations. It is also crucial to check for leaks and ensure the fuel system is properly vented to prevent dangerous pressure buildup.

Where to hook up the red wire

The red wire of the AutoMeter fuel pressure gauge should be connected to a 12V+ ignition source. This could be any 12V key-on source, such as the fuse in the dash or the switched wire on a car radio.

For example, the fuse box under the steering wheel typically has power outlets labelled "ignition", "gauges", and "battery". The red wire can be connected to the "ignition" outlet.

Another method is to drill a 1" diameter hole in the firewall and install a rubber grommet, then connect the red wire to a switched 12V source.

How to wire the backlight

To wire the backlight of an AutoMeter fuel pressure gauge, you will need to connect the white wire to the dash lighting or a switchable 12V light source. This will allow the backlight to illuminate when the dash lights are on.

Firstly, you will need to drill a hole in the firewall for the wires to pass through. This hole should be around 1” in diameter, and you should install a rubber grommet to protect the wires. You can use the supplied brackets and nuts to secure the gauge to the dash.

Next, you will need to identify the correct wires to connect to the backlight circuit. The white wire from the gauge should be connected to the dash lighting circuit or a 12V power source. This will provide power to the backlight. The black wire from the gauge should be connected to a ground point, such as a common metal point on the under-dash structure, or the frame or motor of the vehicle.

Once these connections are made, you can test the backlight by turning on the dash lights or the vehicle's headlights. The backlight should illuminate, providing a clear view of the fuel pressure gauge.

It is important to note that the wiring process may vary slightly depending on the specific AutoMeter fuel pressure gauge model and vehicle you are working with. Always refer to the manufacturer's instructions and take appropriate safety precautions when working with vehicle electronics.

How to extend the wiring

To extend the wiring of an AutoMeter fuel pressure gauge, you can follow these steps:

• Plan the Extension: Before starting, it is important to determine how much additional length is needed for the wiring. Measure the distance between the existing wires and the desired location of the fuel pressure gauge. This will help you understand how much wire you need to add to the existing wiring.
• Choose the Correct Wire Gauge: It is important to use the correct wire gauge when extending the wiring. The wire gauge refers to the size or diameter of the wire. For automotive applications, 16- or 18-gauge wires are commonly used. Make sure to select a wire gauge that can handle the electrical current required by the fuel pressure gauge and ensure it matches the original wiring.
• Purchase Extension Wires: Obtain wires of the same gauge and type as the existing wiring. These extension wires should be long enough to reach the desired location of the fuel pressure gauge, with some additional length for flexibility. Ensure the wires are designed for automotive use and can withstand the temperature and environmental conditions of the engine bay.
• Strip and Connect the Wires: Carefully strip the insulation from the ends of both the existing wires and the extension wires. Use wire strippers to remove only the necessary amount of insulation, exposing the conductive portion of the wire. Then, twist or solder the exposed ends of the wires together to create a secure connection. Ensure that the polarity of the wires is maintained during this process.
• Insulate the Connections: After joining the wires, use electrical tape or heat-shrink tubing to insulate the connections. Wrap the tape tightly around the exposed wire to prevent any short circuits or electrical issues. If using heat-shrink tubing, slide it over the wires before soldering or twisting them together, then apply heat to create a secure and insulated connection.
• Secure the Wiring: Once the connections are made and insulated, carefully route the extended wiring along the vehicle's wiring harness or through the firewall to the desired location of the fuel pressure gauge. Use cable ties or clips to securely fasten the extended wiring, ensuring it doesn't interfere with any moving parts or hot engine components.
• Test the Connection: Before mounting the fuel pressure gauge, test the extended wiring to ensure a proper connection. Reconnect the battery and turn on the ignition. Check that the fuel pressure gauge powers up correctly and functions as expected. Ensure that the lighting and ground connections are also working properly.
• Mount the Fuel Pressure Gauge: With the wiring extended and tested, you can now mount the fuel pressure gauge in the desired location. Secure the gauge using the provided brackets or an appropriate mounting solution. Ensure that the gauge is firmly attached and won't vibrate or move during vehicle operation.
• Final Testing and Adjustments: Once the fuel pressure gauge is mounted, perform a final test of the entire setup. Check that the gauge functions correctly and provides accurate readings. Ensure that the lighting and ground connections are secure and that there are no loose wires. Make any necessary adjustments to the gauge's position or wiring to ensure a reliable installation.

By following these steps, you can safely and effectively extend the wiring of your AutoMeter fuel pressure gauge, allowing you to install the gauge in your preferred location while maintaining a reliable electrical connection.

Where to ground the wires

When installing an Auto Meter fuel pressure gauge, it is important to follow the correct wiring instructions to ensure the gauge functions properly. One of the key steps is connecting the ground wire, which serves as a return path for electrical current and helps ensure the circuit is complete. Here is a detailed guide on where to ground the wires when installing an Auto Meter fuel pressure gauge:

Locate a Metal Point: The ground wire, typically black, needs to be connected to a metal point that is grounded to the vehicle's chassis or frame. Look for a clean, paint-free metal surface to ensure a good electrical connection. Common locations include the under-dash structure, firewall, or the engine block.

Under-Dash Structure: One convenient location for grounding the wires is the under-dash structure. Look for a common metal point that is easily accessible and close to the gauge's wiring harness. This location is often chosen as it is hidden from view and provides a solid grounding point.

Firewall: Another option for grounding the wires is the firewall, which separates the engine compartment from the passenger compartment. Drill a hole in the firewall for the wires to pass through, and then connect the ground wire to a metal point on the firewall. Ensure that the firewall is bare metal and free of any paint or coatings that may interfere with electrical conductivity.

Engine Block: If you prefer to ground the wires directly to the engine, you can connect the ground wire to the engine block or a metal bracket attached to the engine. This location ensures a direct ground and is often used in high-vibration applications to insulate the gauge from vibrations.

Use a Common Ground: It is important to note that multiple electrical components in a vehicle can share a common ground. This means you can connect the ground wire from your fuel pressure gauge to an existing ground point that is already being used by other electrical systems in the vehicle.

Ensure Proper Connection: When grounding the wires, make sure the connection is clean and tight. A poor connection can lead to electrical issues and affect the performance of the fuel pressure gauge. Use the appropriate tools and connectors to ensure a secure and reliable ground.

By following these guidelines and choosing a suitable location for grounding the wires, you can ensure the proper functioning of your Auto Meter fuel pressure gauge. Remember to take the necessary precautions when working with electrical systems in your vehicle.

How to reprime the fuel system

To reprime the fuel system of an AutoMeter Fuel Pressure Gauge, follow these steps:

Firstly, it is important to note that the system is self-priming. If you are experiencing issues with the fuel system, it may be due to air in the fuel lines. Ensure that you have all the necessary parts for installation and that the engine is cool. Disconnect the negative battery cable. Drill a hole for the gauge to mount, following the specific measurements provided by the manufacturer. Secure the gauge using the supplied brackets and nuts.

Next, drill another hole for the wires to pass through the sheet metal and install a rubber grommet. Connect the wires, following the colour-coded instructions provided. For instance, connect the white wire to the dash lighting or a switchable 12V light source, the red wire to a switched 12V source, and the black wire to the ground.

If you are working with the fuel system, ensure there are no sparks or open flames. Do not smoke while installing the fuel pressure sender. Properly vent your fuel system before installation. If you are unfamiliar with this process, consult an experienced mechanic.

Finally, reconnect the negative battery cable and test all fittings and hoses for any leakage. If leaks are detected, identify the cause, and repair before operating the vehicle.

It is important to follow these steps carefully to ensure the safe and proper installation of the AutoMeter Fuel Pressure Gauge and to reprime the fuel system effectively.

Frequently asked questions