FT450/550 4 Cylinder Universal A Harness by Fueltech The FuelTech Universal 4-cylinder A harness is a great addition to any 4-cylinder build and can be used with both the FT450 and FT550 ECUs in a complete plug-and-play style. It is to suit 4 injectors and 4 individual smart coils, wired in semi-sequential fuel injection and wasted spark ignition. It can be used with high or low-impedance injectors; low impedance requires the use of a peak and hold driver, and high impedance requires a peak and hold jumper harness (both sold separately). The harness is set up for either VR or Hall effect cam and crank sensors and includes 3 relays with built-in fuses for main electronics, injectors, and coils. The universal 4-cylinder A harness has a label for each connector and the insulation is heat, moisture, and oil resistant. This harness was designed for systems with up to 4 injectors, 4 smart coils, and up a t upFuelTech Wideband Nano O2 with Bosch LSU 4.2 sensor. It’s set up to run semi-sequential or multipoint injection and wasted spark. It is already wired for FuelTech Peak and Hold drivers when using 4 low impedance injectors. When using high-impedance injectors, a Peak and Hold driver is not needed and in this case, only a bypass connector is required (jumper included). There are 3 separate relays to power the whole system, separating the injectors and coils from the electronics. Please Note: This is only the A harness which is all the FT450 requires. If you are using an FT550 and want to use all of the extra inputs & outputs, you will need to purchase the B expansion harness as well. Features 4 EV1 injectors 4 Smart coils 2 pressure sensors ready for fuel, oil / another 0-5V sensor Extra output connector for generic use Crank and CAM connectors (hall and VR options included) Benefits FuelTech Peak and Hold external drivers ready FuelTech WB-Nano O2 ready GM style intake air temperature sensor ready GM style engine temperature sensor ready Applications Universal What’s In The Box? 1 – FT450/550 4 Cylinder Universal A Harness Warranty Fueltech’s Standard 1-Year Limited Warranty