An LS engine swap is a no-brainer when it comes to adding some affordable horsepower to a project car, but any swap comes with its share of headaches, including wiring. That's where our engine and transmission wiring harness comes in. Fits LS1/LS6 (5.7L) Corvettes and Vortec (4.8L, 5.3L, 6.0L) GM trucks. Fits drive-by-cable applications with LS1 intake manifolds and T56 manual or non-electronic automatic transmissions. Fuse/Relay Box, Fuel Pump Control, Fan Controls, Check Engine Light, Speedometer, Tachometer, OBD2,IAC and TPS, MAF Sensor, MAP Sensor, Engine Coolant Temp Sensor, Alternator Control, (2), Upstream Oxygen Sensors, Crankshaft Position, Camshaft Position, Fuel Injectors, Coil Packs, Manual or Automatic Transmission Control, Knock Sensors.