well I do know that the prndl indicator gets its signal from the 4 pin connector on the trans range switch. At least on a 95 I know it does. Now the 5.3 pcm also uses that connector for I know park neutral at least. So I may try it without connecting it to the pcm and connecting it to the body harness so I have prndl and if the truck does't act right without it I will splice it in afterwards