Help needed key decoder

[Jay748]

Hi I use a saxo as my racing car for grass track I had a 1.4 engine in it but for more power have just fitted a vts engine with engine loom but me being me and not having much luck the connector in the engine bay to connect the engine loom with the loom inside the car is different does anyone know how I can wire it together just so I can get around the immobiliser other than that I don't need any other wires as I have my own fuel pump and start buttons all I have to do atm is have the key taped to the copper ring normally around the barrel so it will start but seeing the connector is different I am unable to do that so can't frt the car started. I have a race next Sunday ans would really like to use the vts but if not I will have to put the 1.4 back in for then.

Thanks in advance, Jay.