Fuel Line Kit with Gauge & Fittings Chrome Fits Holley 4150 style Carburetors with 9-5/16 Inch Centers Mr GasketFits Holley 4150 style carburetors with 9 5 16 inch center to center fuel inlet spacing. These fuel lines are not only great looking but are very functional. They incorporate a small, convenient 1 1 2 inch diameter fuel pressure gauge. The gauge is designed to read in 1 2 PSI (pounds per square inch) increments and has a range of 0 15 PSI. Inverted flare female inlet thread size 5 8 Inch18 Inch Chrome Plated Fuel Line Comes With 0 To 15 psi fuel