There are two Main Reasons that Aftermarket fuel sending units do not give accurate fuel level readings.
The first and most important is that the wire-wound variable resistance board on the stock sending units are shaped and wound for the tank that it was intended to be used in.
Therefore the resistance levels are not linear from end to end. Empty is somewhere around 73 ohm and Full is somewhere around 10 ohm with the in between readings changing in Non Linear steps.
Stock Non-Linear Board...
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The first and most important is that the wire-wound variable resistance board on the stock sending units are shaped and wound for the tank that it was intended to be used in.
Therefore the resistance levels are not linear from end to end. Empty is somewhere around 73 ohm and Full is somewhere around 10 ohm with the in between readings changing in Non Linear steps.
Stock Non-Linear Board...
Read more
