problems installing alarm system

Hello guys

Nissan micra 1999 si t reg car had locking system that was installed buy someone and was unknown make the wires were attached to the Nissan black box above fuse box not sure what this is think its Nissan locking systems they linked wires in to this boxes leads I have managed to fit new motors to doors but system did not work now i noticed fuel gauge not working and internal lights gone off can any one advice if I can wire my own locking and alarm on car I don't want to use immobilizer on alarm reason for install is remote off this locking will no longer work on car and unknown make i had to buy new system new one is made by hawk

thanks gareth
 
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