Just finishing up my 5.3 with 4l60e swap in my 1990 Chevy Silverado. I ordered a PSi harness for the swap an everything was super easy to install an was very clean. My only gauge I don't have work right now is my speedometer. On my harness I have one wire coming from harness labeled speedometer . I cant seem to get anything to work. I know on 90 the instrument cluster has the drac built in . so my question is where do I need to hook the single wire for my speedo to work?? I have searched on forums several times an still really don't get a clear answer