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This is the first time this has ever happened to me. I've had the project cougar guages in my car for a while now, and have filled up the gas many times and the needles work fine. Today I changed the spark plugs, had the UIM off and cleaned it really good. When I got gas tonight, the needle went to to the full mark, and the digital 'miles to fill up' went to 292. After driving for a couple minutes, the guage just went to the empty mark, and the 'miles to fill up' displayed "---". I pulled over, sat there looking at the guage, and all of a sudden it went back to the full mark. This happened twice tonight. What's going on?

Mike
 
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