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Been having trouble with fuel gauge. Often it reads full when I know tank is not full. To remedy I've started using the fuel used and total fuel remaining gauges on the glass cockpit. To check accuracy I marked level on fuel tank added 15 gallons of gas. When fuel used gauge read 15 gallons I rechecked tank and level was just about on mark. Seems pretty accurate. Now when I add gas, i just enter amount into the glass cockpit.
Anybody else using thise gauges?

What engine make do you have. The VP's have two calibration processes you do at the EVC. I did the Full Fuel Calibration (the simplest) and it is fairly accurate.

On our R5 with a Mercruiser, it reads full for a long time. Based on fuel used, it is pretty accurate when around half full. As the tank empties, the gauge appears lower than it really is.

I go by fuel remaining. It seems VERY accurate.

You can correct the inaccuracy by adding a resistor to the sender circuit. The sender typically has a resistance of 30 ohms at full and 240 at empty, for a range of 210 ohms. If the gauge is reporting 10% too high, theoretically you would add 21 ohms. Try adding 15 and see if you like the results. If it is reporting too low, you have to add a resistor in parallel and the math is a little more complicated.

You can correct the inaccuracy by adding a resistor to the sender circuit. The sender typically has a resistance of 30 ohms at full and 240 at empty, for a range of 210 ohms. If the gauge is reporting 10% too high, theoretically you would add 21 ohms. Try adding 15 and see if you like the results. If it is reporting too low, you have to add a resistor in parallel and the math is a little more complicated.

I didn't notice the remaining fuel option on our Garmins. We're making a trip to the lake in a few hours, and I'll check.