NEW ELECTRONIC ENGINE HARNESS FOR 383/440/440 CUDA/CHALLENGER FOR 1972-74 and 72 CHARGER AND ROADRUNNER. HAS no TACH LEAD BUILT IN. YOU WILL NEED A RETAINING SCREW FOR THE ECU PLUG. THESE ARE RIGHT ON THE MONEY FOR CORRECTNESS WITH ALL FACTORY PLUGS AND LENGTHS. If your 74 car was built AFTER nov of 1973, this might not fit. later 74 cars got entirely different plug arrangement
When only usa made will do!