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Installation instructions for discontinued 20-0091 Fuel Rail (discontinued)
PORTS AND FITTINGS
The fuel rail ports are tapped for 8AN ORB and 1/8 NPT.
8AN ORB Adapter Fittings can be found HERE.
8AN ORB Direct Mount Regulators can be found HERE.
8AN ORB Fuel Pulse Dampers can be found HERE.
1/8 NPT Adapter Fittings can be found HERE.
Fuel Pressure Gauge Adapters can be found HERE.
Appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.
This large bore fuel rail features a large 0.69" diameter internal bore. It uses all 5 OEM mounting bosses. The fuel rail is machined, anodized, and laser etched for a high quality surface finish. 
It is compatible with all fuel types including popular alcohol mixtures such as E85. It is also designed to work with OEM fitment fuel injectors.
The factory fuel pressure regulator can be used or the port in that location can be used for a 1/8" NPT fuel pressure gauge, transducer, plug, etc.
This kit eliminates the OEM fuel rail cover and also replaces the air pump system hard tubes with vacuum hose for a cleaner appearance.
20-0591-02 Fuel Rail, S2000, 00-05
This basic setup does not include fittings. Replacement vacuum tubing is included to simplify and eliminate the hard lines. 
20-0091-PK Fuel Rail Plumbing, S2000, 00-05
The plumbing kit includes the items shown in the image below.