that or: pending on your o2 sensor, if it is a 4 wire, colors should be grn, blk,blk,and white. white would be the signal wire. again, depending on your o2. mine on my 92 integra is a 4 wire like i just explained. most of the time its easier to do it this way, could be difficult finding signal wire into your PCM from the o2. through the fire wall and straight down baby. good luck, hope this helps.