L67 Manual Transmission

Howdy folks,

Rewiring the dash after going to a standalone transmission controller. Most of the transmission wiring is pretty obviously now headed to the standalone controller and stuff like the performance shift button aren't going to work. My big question is do I need to continue to send the VSS and stop lamp information to the PCM since the standalone is taking care of the speedometer and I don't have cruise control either?

Perhaps bigger question is how does the PCM know when the car is in gear now since this is still an automatic? Should I keep PRNDL switch wired in?

Thanks