Opel Power Steering Pump
This type of power steering pump is made by TRW and used in the Opel/Vauxhall Astra G and Zafira A. It's called the "Type 2" or "TRW 2" pump and is known to be quite noisy.
The correct oil for this pump is Fuchs TITAN CHF202 (formerly known as Pentosin CHF202) or anything that fulfills the Opel requirement 19 40 766. It has a green color. 
Electrical Connection 
Pinout and Cables
|Black||0.75mm²||+12V Ignition Signal|
|Blue-White||0.75mm²||Alternator Pin 61|
To ensure a quick start up of the pump the signals on the black and blue-white wire need to be sequenced. The black wire indicates that the ignition is on. This alone does not start the pump, probably to save battery capacity for starting the internal combustion engine. Only if there's voltage on the blue-white wire present the pump starts. This would be connected to the alternator to indicate the engine is running and the alternator provides enough current to feed the power steering pump.
Connecting both wires together and feeding them +12V at the same time works as well, but results in slow spool up of the pump.
The pump can be accessed for diagnostics via K-Bus. This has not been reverse engineered yet.
The pump should be connected via an 80A fuse to the 12V. The initial current will be quite high, the idle current should be around 6A without delta pressure from the steering column.
Mechanical Connection and Dimensions
The hydraulic high pressure line has an M16x1.5 thread .
- Diameter: Return line
- Thread of high pressure line
- Mounting: Threads, Angle, ...