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Old 08-21-2003, 05:00 PM
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Thomaspin Thomaspin is offline
Join Date: Jun 2001
Location: CA
Posts: 531
You might try pulling the instrument panel, removing the gauge and placing a drop of very light (jeweler's) oil on the needle's shaft.

I changed the sender on the 1983 300SD and the needle still remained erratic - the oil fixed it for once and for all. (If anyone cares, this thing bugged me for 5 years!). While you have the panel out, check that all the ground (brown wires) connections in there are clean - if not use some emery cloth to celan them up.
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