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There is a section in the menu for entering the alarms settings for the low and high values of each performance data. You will want to set the alarm for low fuel level to zero (or to a value which will work for you).
While in there I would go ahead and setup a temperature alarm. Everyone probably has their own value but think mine is set to 215 or something like that. I also have the voltage alarm set to 12.9 low and 15 as high or something close to that
I think he wants to turn OFF the alarms. The alarms only work if you enter fuel menu each time you add fuel. This can get old at times- so I just went in and turned OFF the fuel alarms.