Changing a 1.4 duratec to a 1.6 vvt

[Rosko]

Hello all, I currently dive a 2005 Ford Focus mk 2 and have had huge problems since I bought it 

I bought the car with a 1.4 duratec engine and about 5 days later started showing signs of head gasket leaks, after that I nct (Irish mot) and passed it. I bought another car but it has a 1.6 vvt engine . After swapping the engines I can't get the camshaft sensor to connect and it now causing the engine light to show up and making gear one shake the car as if it wants to stall 

any ideas on how to stop this?