Audi Repair: Audi A-6 Electrical Problem?, audi a 6, physical reason

Question
I have a 1998 Audi A-6. Frequently the tachometer will stop functioning and, at the same time, the oil can, the ABS, and the brake lights will come on. When the tachometer resumes functioning the other lights go off. We have had the car checked and there does not seem to be any physical reason for the warning lights. It seems likely that this is a short of some kind.Taking this vehicle to my local Audi dealer is not an option, they could not diaginose a problem if it stood up and waved at them. Any ideas on where my problem may be, and how to repair it?

Answer
hello
sorry it took so long, I was asking around and nobody get this yet.I will make sure connectors are not loose at the cluster. I have seen some problems with clusters (lights on with no reason)but who knows. Make sure there is no faults in cluster, but for this you will need some scanner. If you get any faults let me know this will help a lot. OR
If you know somebody with same car 98-00 swap the clusters .
good luck                    pltech