Honda Civic Repair Question
In the repair manuals for the car, not the owner's manual they cover a test of the sensor/sender unit. It is highly possible that you have a shorting wire. Get the manual and test it. I think all you need is a volt/amp meter. But it sounds like either a faulty sensor/sender or a short. The final possibility is the gauge itself.
Costs - I can't address that. Shorts are difficult to find (especially when the weather is cold like it is up here).
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