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.......
It been sometimes am missing from ZTH. I need to find aircond cleaner to clean my cooling coil. Yesterday open the cooling coil box and notice no filter attach. Damm.. I tought it should be standard issue...