92 300D. Exterior temperature gauge is intermittent. Will be on or off for random amounts of time without my doing anything. However, if it's off and I want it to come on, all I have to do is smack the dash area beneath the instrument cluster and it will come back on. So it seems pretty clear there's a loose or dirty connection.

How do I access it and troubleshoot?

Thanks.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Lets' Pull the Instrument Cluster!

Rgds,
Chris W.
'95 E300D, 360K

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Objects in closer are mirror than they appear.

Sounds like a bad ground to me. After you pull the cluster make sure the bundle of ground wires behind the cluster are contacting well and the connection is tight.

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