Hi there - all manufacturers provide fuel gauge operation in the "Run" position. Almost all include fuel gauge function in the "Start" function - although some use that switch setting to test gauge operation momentarily (gauges swing full range, then settle back to a representative reading). Some manufacturers provide fuel gauge function in the Accessory position, along with select functions like windshield wipers, radio, heater fan, aux. water pump, etc. As more and more manufacturers utilize a Body Control Module to actually route power to components rather than hard-wired switches, this kind of function will become more customizable for drivers.