100PSI Sensor

The 100PSI Sensor from HOLLEY (MPN 554-102) is a stainless steel pressure sending unit designed for fuel system monitoring in performance and stock applications. This sensor integrates with Holley Pro-Jection fuel injection systems and other compatible EFI platforms that require real-time fuel pressure data. Whether you're building a carbureted engine conversion, upgrading to fuel injection, or maintaining an existing system, an accurate pressure sender is essential for engine health and performance diagnostics.

Engineered with stainless steel construction, the 100PSI Sensor provides reliable corrosion resistance and longevity in fuel tank and line environments. The unit measures fuel pressure across a 0–100 psi range, making it suitable for both carbureted and modern EFI fuel systems. The sensor's design ensures accuracy and repeatability, translating actual fuel pressure into consistent electrical signals that feed engine control modules and aftermarket gauges. Compact at 4.3 x 2.4 x 4.8 inches and weighing just 0.27 lbs, it installs easily in tight engine bay spaces without adding significant weight or bulk to your fuel system.

This pressure sending unit is ideal for hot rod builders, performance tuners, and engine swap enthusiasts who demand reliable fuel pressure monitoring. It pairs seamlessly with Holley Pro-Jection systems and works with standalone ECUs, MegaSquirt systems, and traditional analog fuel pressure gauges. Installation requires basic mechanical knowledge—typically mounting in-line with fuel rails or in the fuel tank supply line. Verify your fuel system's nominal operating pressure and electrical connector compatibility before purchase to ensure proper integration with your specific setup.