Hello Boulder, I am in Niwot. My XR is a Gen 1, no TFT, but I also have an R1250RS with the TFT, I can show you a lot about it.
To get gas gauge in the main screen: press the "Menu" up arrow on the left cluster, repeatedly, to scroll through one item at a time to display on the top center of the TFT. One will be the gas gauge, another is miles too empty.