Hey guys I swaped a 2004 ls5.3 and a 2005 4l65e into a 1998 GMC Sierra 4x4 with the Lextech pin out. My speedo, alternator, and oil pressure gauges work. How ever the fuel gauge is way past full but moves, no tach or engine temp gauge. Wondering what exactly has to be done so my local tuner can do this or do I need to mail the ecm to someone. Any help would be great thanks guys