We have fuel flow meters and a gas use in gallons read out (Look like original SeaRay equipment). We have confirmed it to be accurate over time. The tank gauges are not. When they read near empty we still have 1/3 tank left. From half to full they seem to be good. You may want to run your boat until your gauges read empty them fill up to see what you really have. We go to Alaska and running on a gauge that says E is scary but knowing we have 1/4 tank left is good. We carry 25 gallons of gas on swim platform for the dinghy, that also make one feel happy.