I'm not a tech, but from my understanding, it would most likely be the sending unit and not the guage.
I believe it wouldn't be a major ordeal to change the gauge itself, but I would think getting the sending unit test and replaced if needed should solve the problem.
Wait for a tech to answerthis one. i think it's probably the sending unit.
Alon
------------------
'92 300CE
Metallic Black (Blue Flaked) on Parchment
Clear Corners
94-95 Tail-Lights
Black Grille Insert
78.5k Miles
Future Upgrades:
Sportline Suspension
17" AMG Monoblocks or EVO II's
Euro Headlights
Performance Chip
AMG Exhaust
Click here to Go To My 300CE Page