The Nitrous Express fuel pressure gauge (0–100 PSI) includes a 4AN manifold for installation in a 4AN line, and the gauge uses male 1/8 NPT threads. This precision gauge and manifold combination is intended to let you monitor fuel pressure inline with common 4AN plumbing, simplifying installation when integrating a fuel pressure readout into a fuel system or nitrous-supporting setup.
Nitrous Express Fuel Pressure Gauge (0-100 PSI w/Manifold)