The tank indicator gauges are on the main control panel which should be located in the end of the overhead cabinet (over the sofa) as you first walk into the trailer through the main door. Along the top row of buttons you'll find, on the far left, a button marked FRESH. Press that button and vertical lights along the far right side will illuminate to indicate the tank status. You'll also find the battery, black and gray tank level gauges along that same row of buttons. Here's a photo I found on the internet that should be similar to your control panel.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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