8 The gauges do not come with the wire needed to hook up the sensors. You have two options when it comes to the oil, water, and tach. You can use the factory wires and change the terminals, or you can run new stuff. We decided on the latter because we needed to run new wires for the pulse converter anyway. All the wires were kept away from hot things like the exhaust system. We ran our new speedo harness right where the factory speedo cable was.