2-1/16" CAN-Bus Fuel Pressure Gauge | 0-100 PSI with Warning | Holley EFI

SKU: FHO2-FP4-HLY
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$177.28 USD
Reads fuel pressure data directly from the Holley EFI ECU through the CAN network. Eliminates extra signal wiring and external sensors when supported for a cleaner install. Precision stepper motor delivers smooth, accurate readings with programmable warning functions and a settable warning light.
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Order leaves our facility in about 2 Weeks
⚠️ Required: Holley EFI Gauge Module (Part 554-130) is required to connect the gauge to the ECU (View on Holley.com).

Holley EFI Fuel Pressure Gauge reads fuel pressure data directly from the Holley EFI ECU through the CAN network for a cleaner install with no extra signal wiring or external sensors required when supported. Built for seamless integration with Holley EFI systems, it delivers real-time fuel pressure data while keeping the setup clean and straightforward. A precision stepper motor keeps the needle smooth, stable, and accurate at a glance, while programmable high and low pressure warnings and a settable warning light add a clear visual alert when fuel pressure moves out of range. Built for long-term use, it’s made in the USA and backed for life.

Track-Tested. USA-Built. Backed for Life.

Key Features:

  • Direct ECU Fuel Pressure Data — reads fuel pressure directly from the Holley EFI ECU through the CAN network
  • No Extra Sensor Wiring — eliminates added sensors and signal wiring when supported
  • Holley EFI Compatibility — built for seamless use with supported Holley EFI systems
  • Application-Specific Ranges — available in multiple pressure ranges depending on the gauge
  • Programmable High/Low Warnings — clear visual alerts when fuel pressure moves out of range
  • Settable Warning Light — user-configurable visual warning for out-of-range fuel pressure conditions
  • Microprocessor-Driven — real-time accuracy
  • Stepper Motor Precision — smooth, accurate pointer movement
  • Factory-Style Finish — clean look that integrates easily into street and performance builds
  • Made in the USA — backed by a lifetime warranty
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Built to last. Backed for life.
  • Lifetime warranty on internal circuit board electronics
  • 5-year coverage on sensors and wiring
  • Applies to gauges purchased since Jan. 1, 2006

Every Speedhut gauge includes a lifetime warranty* on the electronic circuit board inside the gauge case. It is the core of the gauge — the part responsible for the precision communication that delivers the accuracy and performance Speedhut is known for.

Sensors, wiring, and other external components are covered by an unlimited 5-year warranty.

This combined lifetime / 5-year warranty applies to the original purchaser.
*For your lifetime — as long as you own the gauge — we stand behind it.
Speedhut Inc warrants products to be free from defects in materials or workmanship. This warranty is limited to repair or replacement. Speedhut Inc is not responsible for incidental or consequential damages. Improper use, installation, or unauthorized modifications void this warranty.


Ensure you are using our sensor, most other sensors will not work with our gauges.


With the harness disconnected from the sensor and the gauge powered on, measure the voltage across the red and black wires in the harness at the sensor end. Here you should see 4.9-5 volts. 


Once you have confirmed the voltage, short the red wire to the white wire, this should make the gauge sweep full scale. 


With the harness still disconnected from the sensor, go to key-on or start the car. With the sensor disconnected the gauge should stay at 0 or the bottom of the scale.


If all those turn out normally, next we'll test the sensor. Disconnect the harness from the gauge, and reconnect it to the sensor. Measure voltage between the white wire (signal from sensor) and black wire (ground) and you should see a range between 0.5 to 4.5 volts. You will need to supply power and ground to the sensor while it's disconnected from the gauge. You can use short paperclip pieces if needed.

Our fuel pressure gauge isolates the fuel at the sender and does not enter the vehicle. You will not need a fuel pressure isolator to run our gauge. The wire harness and sender are included with the gauge.

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