I now have a new problem. I keep getting a 24 code- vss the ecm is a 165 with a 89 f body chip My truck is an 85 but it had the vss for the cruise, optical type. when did the camaro/firebirds go to a electronic speedo. The optical are square wave and the electric is what? Mike Rolica Meridian Magnesium Products Strathroy, Ontario (519)-245-4040 Ext: 260