Ok so it's been quite a few years but in the middle of an engine swap I was easily able to access the inhibitor switch to add the diodes. This will isolate the Park and neutral indicator lights in the head display so they no longer both come on at the same time whether in Park or Nuetral. I'm not sure if I put the diodes cathode in the correct direction. If power comes from the 52 plug which I think it does then the cathode of the diode is in the wrong direction. Any thoughts ?