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The gauge is a coil of wire, they either work or they don't. What controls their position is the fuel sender, it acts as a big resistor. Low resistance at high fuel levels makes the gauge high, resistance increases as the fuel level drops. If you have a crappy fuel sender or the wipers are contaminated, the resistance will be increased over normal and you'll read lower than you are in reality. That's also why flaky senders cause the tank to read empty, infinite resistance is "high".
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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