gas guages on boats are not very dependable. u could take your old one out, run it up and down and see if the needle reacts accordingly. i didn't have a gauge for 20 years. figure your mpg and set your trip odometer on your gps. with the old merc, i got 2 mpg, so i had a 120 mile range. the new motor has a smart guage that computes fuel useage and subtracts from the size of your tank and gives your fuel remaining as a %. i still set my gps and keep track of mpg.
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