Help! Re Transit 2.5di 1993 MK4

Alarming a ford transit Mk4 2.5di 1993 vintage. problem is with the immobiliser wiring. have to break the ignition switch on cable and are
unsure what colour cable to attach to, Have haynes manual but wiring diagram not too clear any help much appreciated. also unsure what colour is the accessory wire. Many Thanks Rockingcrocks
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