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A. S&P Liquid filled fuel pressure gauge (85 to 89 uses a long stem 90 to 92 uses a short stem) B. TPI O-ring to AN6 fuel line adaptors (85 to 88 Vette and 85 to 92 Camaro uses a 16mm and 14mm. 89 to 91 Vette uses two 16mm to AN6. The 16mm adaptors are also used for the GM/AC DELCO GF481 fuel filter. 16mm o-ring fittings will also fit the pressure side of the GM/Saginaw power steering pumps.) C. Adjustable fuel pressure regulator.