Yesterday on the lake I ran one tank low until the “F” for fuel showed up on the tach gauge. To the left of the “F” an “A” would intermittently light up too. What does the “A” mean?? I can’t find it anywhere. When I switched tanks, both the A and F went away. No alarm faults or anything like that. Boat is a 2013 Puma FTD 250 Pro XSThanks in advance