Firstly, apologies for no picture. But when I had the instrument cluster out and under panel apart recently on my 320TE, I found an odd slim metal pin/prong, with no obvious home. It looks OEM, with an electrical plastic plug moulded on one end with 2 wires, and it tapers to a point at the other end. It's about 10cm/4 inches long in total, and only a few mm in diameter. It looks like a small knitting needle!

Anyone have an idea what it might be?

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

I have a W124 andj ust replaced the pot gears in the speedo head. I did not see anything like your talking about..Can it be from the day it was built .Some kind of checking device for voltage meter .And had been left behind. But for more help on this , a picture is needed.