swapping in my buddies 96 civic

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Ok so we are swapping a D16Z6 into his car...and I need to know if he needs to get a OBD2-OBD1 harness or can he just run his P2E ECU for right now (without vtec) until he gets a P28...or in order for it to work does he need a harness? cuase he wants to get a P28 ecu but he can't find one and he doesn't really have money for one right now...so I was wondering if we can just throw the engine in there and use the ECU he has without any harnesses or what not...thanks for the info!