daftdrifting

i have a twin turbo 13b motorset from a fd .i have all wiring and ecu. i noticed 1 plug for ecu is missing! im thinking its located under dash of the fd ? i was swaping this motor into a 1973 rx3 and all stock with a fmic. he wants to keep it all stock so i just wanted to use the stock wiring. im use to nissan motors and the wiring is a breeze. i think the plug im missing is b101 ? or somthing. also i have no ignitor eather.. how does that connect to the motor ? chasis harness ? i didnt see any plugs on the engine harness for it. thanks