1、Fitment: The standalone wiring harness is a replacement for Hummer Drive By Wire 4L60E Transmissions, please check the model and year before ordering. 2、Design: The harness comes with needed dash connectors, include speedometer, tachometer, park neutral, TCC, malfunction indicator, and a DLC port. 3、Main Function: The wiring harness is designed for retrofitting engines and 4L60E transmissions into older cars or newer non emissions controlled vehicles. 4、Practical: Harness allows use of the factory intake manifold to plug and play with four wire hookup (switched power, constant power and ground connections required). 5、Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability.