sup man if your looking at this here is how to look hook up your tach-----------------> if your looking at your ECU and its still bolted up to the car, the wires are on the right side. there are 5 connections . starting from the top will be no. 1 and so forth with 5 at the bottom. on connection no. 4 is where you will be working there is a solid green wire there it is the only one. get one of those wire tap things and tap away i would not recommend splicing into it yourself. Enjoy