i'll give it a shot since i use by dual gauge setup for my shift light....
you'll need to start by selecting the rpm function when deciding what parameters you want to have scanned. from there, go into the annunciator setup and select the rpm function. once selected, you'll need to set it so the lights lite up above your rpms you want otherwise it selected below the lights will be on the whole time. following that just decide your rpm where you want to shift.
i believe that's that why it goes. i'd go to my car and look, but it's three hours away at the moment.