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It sounds like you've got mix-n-match parts between a speed-dependent and RPM-dependent power steering systems...
The RPM-dependent system is more common and cheaper of the two.
The higher the engine revs, the more fluid and pressure goes to the rack.
Pretty straight-forward and simple system to design and build, since the PS pump is directly connected to the engine (via pulleys).
The speed-dependent system requires a computer that bleeds off pressure as vehicle speed increases.
Additional parts include a VSS (vehicle speed sensor - duh), a computer calibrated to handle the bleed rate, and the extra hydraulic fittings and ports for the bleed hose channel.
This is why you see the extra, 3rd port.
-Ted
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