Hey All,

On the highway the other the day the engine temp gauge on my '91 300E started bouncing between engine temp (under 80*C) and the bottom peg (0*). It would intermittently read temp and then bounce around & fail.

My question: Which sensor feeds the gauge, where is it located, and how can I test it?

I see three sensors/sending units listed on Fastlane: eng. temp. sensor, water temp sensor, and water temp sender, but I'm not sure which feeds the dash gauge.

I'm sure it's easier to check the resistance of the sending unit under the hood before I try to rip the Instrument Cluster out & look for loose wires/bad gauge...

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress