Profile: Fuel Injection Specialties is a supplier of OEM and specialty fuel systems. We offer fuel injector reconditioning service, GM port injection, engine wiring harnesses, tuned port injection, LT1 / LT4 / LS1 engines, automotive diagnostic equipment and injection connections. Our torque converter control lock-up kit is a non computer controlled interface kit that can be used with or without a computer controlled engine and it locks up when the transmission shifts to 4th gear and releases when the transmission downshifts to 3rd or when the brakes are applied.