Wiring injector plugs

I'm now wiring up my new injector plugs to the Bosch VXT injectors but I'm not sure which way round the 2 wires are supposed to go?

They are labelled as 1 and 2 but I'm not sure which one the ground (pink and brown wire on all 4 injector leads) goes to.

Can anyone help?

according to the TIS wiring diagrams, pin 1 on the z20let injectors is positive and pin A on the z22se is positive :thumbup:

Ta vocky, I figured it out evetually 🙂