The temp. sensor cable is only a two wire cable with a heavy smooth black, round cover. The wire colors are Green and Brown. The replacement sensor comes with about six feet of the same cable, but you only need to use enough of the lead to get the splice up out of the weather.The length of the wire has no effect on the accuracy of the gauge. Now if your gauge has no display you have another problem. I'd first solder and shrink tube the cut leads back together and see if that has any effect. I'm doubting that it will, but it's not normal to disconnect any thing in your engine bay by cutting it. But then you already knew that.