You display the TLA100 tank level on a DSM200 or DSM250 in the following way. Enter menu mode, scroll to "Favorite Screen Setup..." and press enter. Scroll to the favorite screen where you would like to view the tank level and press enter. Scroll to "Data:" and press enter. Scroll to "Tank-xxxx #y" and press enter (xxxx is the tank type like Fuel, Fresh Water,etc. and y is the tank number). Scroll to "Level" and press enter. Press the back key three times to exit menu mode and return to the normal viewing mode. Scroll through your screens to the favorite screen you selected for tank level.