overhead console
#2
Linked is kind of a strange term here....... the PCM monitors the gas gauge..... and the overhead gets its cues from the central timer module. (basically, you have a small network in your truck, with the CTM being the hub.) If the truck doesn't know how much gas you have, I don't think it will be able to tell you much about fuel economy/range etc.
Welcome to DF!
Welcome to DF!