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I'd be more inclined to suspect the sender than the gauge. The gauge is nothing more than a coil of wire. Not really much to lose calibration. If the fuel sender has a layer of varnish on the wires or otherwise contaminated, you'll get really weird readings. Try (GENTLY) cleaning the wires with steel wool, then hosing down the wires and the wipers that ride on them with carburetor cleaner. Worked for my SDL and you couldn't believe the varnish layer that was on there.
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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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