Hooking up 2k camaro gauges in 72 chevy truck along with ls1 and 4l60e. Have SES light, VSS and oil pressure gauage hooked up on cluster harness/connector, but how does fuel, temp, tach, and volt gauges work if no pin in connector for them??? SO only other wire i dont know about is Class 2 serial data wire which is GRY and pin B6 on cluster:think connector.