my gas gauge does it every once and a while and so does my oil any ideas why

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Dan Younes
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1985 euro 500sel 220k
1981 300sd 278k sold
1979 240d 298k sold
1983 300d 272k sold
1989 chrysler 2.2l Turbo
Leabaron 130k
1991 300e 2.6 (hopefully soon)