If you haven't done so, go to definitions on the first part of this obd1 forum and go to pcm 6395, $OE. Towards the bottom is 6 wiring diagrams. With that you have what you will need. You pretty...

I went to a local yard that had a 95 7427 454 4l80e truck and told them I wanted the complete harness and they pulled it out for $75. Sorry maybe I missread. Looks like you have an original harness....