I have the standard Van's single resistive senders providing a signal to a Dynon Skyview. They appear to give a very accurate reading from 14+ gallons down to 0. As the gauge changes from 11 to 10 gallons, you can bet you have burned 10 gallons from the 21 gallon tank. If the senders were hooked to an analog gauge I would not expect that accuracy.
I had a Bonanza for years with two senders per tank. Left side was pretty good the whole scale. Right side would rapidly move from full to 1/2 tank as the first 5 of 40 gallons were used. Fairly accurate for the remainder of the scale. Could have made it better for a couple AMUs.
I am convinced accuracy has to do more with what is getting the signal rather than the sender. Thank goodness for the red cube.
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Dave
M20C
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