I?ve had a problem with the Speedo in my 406 for a few weeks now, hopefully going to get time to sort it out shortly by replacing the sender unit and transducer.
However, a couple of times over the last week or two my rev counter dropped to zero a few times. Seemed to do it at exactly the same time as the speedo.
Yesterday however was the scary one. The speedo, rev counter and fuel gauge kept flickering, occasionally dropping down to zero and ?wiggling? around the correct reading. The engine note didn?t seem to be affected. Also, the temperature gauge seemed to be ok. This happened for about 10 minutes, and the speedo gave up shortly after.
This has worried me a great deal. Is there something else that could be amiss here? I don?t want to have to change the sender unit/transducer only to find it?s something completely unrelated. I?m thinking if it?s happening to all three (albeit separately), maybe the sender unit is ok?