Here are a couple of screen shots from the dash in the $EE-16188051-V3.8.adx file. You can see the gear indicator changes from OK to YES or the P/N indicator changes from In Gear to Park-Neutral. I'm sure you could do similar with the 4L80e. This may not do what you want though because the internal switches don't distinguish between park and neutral.
trans3rd.PNGtransNeut.PNG
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