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I too suffer from erratic fuel gauges on my 73 with capacitance-type senders feeding a signal conditioner (P/N C668004-0102). Because typically the guages go to zero together, we started out by tackling the signal conditioner. Found all connectors OK so we opened the box and found a component whose discoloration suggests that it's burnt (see figure below). Hard to believe that this is it, since 30-40% of the time the guages read accurately, but we'd like to change out the component. Problem is, we can't read what it is. If anyone has a schematic or knows what the component is, please let me know. Meanwhile, we're going to look at the other suggestions, namely the inboard wing connectors and the long plug behind the guages.
Thanks,
Ernie
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