??? Cable harnesses, immobilizer engine dynamometer ???

Moin moin, have installed a Z18XE Bj. 2004 from an astra G on an engine test bench. The engine itself is almost completely wired. Need now the or the harnesses to connect the gas poti and the gasoline pump. with Opel itself can unfortunately not help me without order number, because they apparently cannot recognize the individual connections and the exact course of the program. Can someone tell me which wiring harness they are hanging on? order too many of them because they are quite expensive:-( How does the immobilizer work?? it only turns off the petrol pump, or also the ignition?? Can I possibly bypass it somehow?? MfG Alex