1988 260E with 300,000+ miles. Just got in and cranked the car - started fine but heard a noticeable buzzing sound from behind the instrument cluster. Saw that the speedometer worked fine (cable driven) but the electronic gauges were not working (tach, oil pressure, fuel level, etc).

Stopped and popped the hood - the sound was up by the firewall but muffled - sounds like it is behind the instrument cluster but before the firewall. Got a quick recording of what the buzzing sounds like by turning the car off then turning the key back to run. Here's a 9 sec video of that.

Any ideas?

Rick in Raleigh

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Rick in Raleigh
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as of May 2011
'97 S320 LWB 325,000 miles
'88 260E 332,000 miles
'72 220D 338,000 miles (sold)
'73 BMW 3.0si 473,000 miles (retired)