OK I know someone has to know, I have a 1990 GMC Suburban, parking brake light stays on, no speedometer, giving code 24 "vehicle speed sensor". I have replaced the sensor, the ABS control module, and the ECM, stil no result, took the instrument panel apart all looks good except single black wire coming from one of the panel lights not connectecd to anything, but that light works. Anyone have any idea what I am missing?