This image from Rennlist of the cup setup is quite useful. Clearly there's a power cable with a relay in it - presumably this is driven from the ignition switched live from the car itself.
A guy on 986 forum says:
- PS pump wiring is as follows:
red - battery +12V
brown - ground
black - ignition +12V (i.e., only runs when key is on)
blue/white - alternator dash light (to turn it off if the key is on but car not running)
brown/white - not required (for diagnostics)
As far as the plumbing goes I'd have a chat with a Pirtek shop if there's one nearby you. They've made me up power steering pipes before while I waited and have every conceivable hydraulic fitting normally in stock! Clearly there will be a high pressure line which will need crimped fittings. The return line will be at much lower pressure and will probably just need hose clamps.
Maybe worth getting a 986 steering rack so you can examine the threads at your leisure! I see there's one on ebay now for £60.