You still wont get it to work, the ECU's in the ZS dont have anywhere near the sensor inputs/outputs to do this, the Focus speedo head etc needs the various ECU's to work, just like the Rover 75/MG ZT, the speedo information was held in the light control module, so if the instrument pack went faulty the dealer had to recover the stored info from the light module before re-programming the instrument pack, it isnt just a simple plug'n'play system like a PC, lots of different perimeters are required.
The Mk5 Astra for
example, if a breaker is selling bits from it he includes the ECU/Instrument Pack/Keys/looms etc.