In a message dated 12/21/99 5:42:39 PM Eastern Standard Time, captaudi@ma.ultranet.com writes: << The three wires are brown/white = ground, green/white =referance to ignition module, red/black = 5V referance from control unit. The tach signal is supplied to the cluster from the knock sensor control unit. HTH >> Thank you and to all those who replied, that was just the info I needed.. Javad