the 4 wire.red for ignition +12v,orange for +12v battery,black for grounding and white for tacho input. The 2 wire socket for shifting light.Becoz it using led type be sure you connect this 2 wire correctly.Otherwise it won't light....
sorry for the mistake.......
I have been using ron 95 for about 5 to 6 tanks. Recently i have got a burned engine valve. I am not sure whether it's due to the ron95 or not. i have using my turbo engine 3sgte 245 for about a year...