LS swap and Dakota Digital - gear position?

[cpnbnanamn]

So I'm working on completing my LS swap into my '78 K5, and trying to wrap up the DD install as well. Initially, I didn't think I'd get a gear position indication on the DD display. but I do! HOWEVER - (and I'm NOT using the Gear sensor module they have - Coming straight fro the ECM to the BIM) In Park and Neutral I get an error. I was shocked to get the display in the first place, and I have no intention of getting that module. Is there a setting I've missed that will correct that error? It shows correctly if I'm in anything else besides Park or Neutral.