Audi dealer has broken my car

[awoolhouse@zetex.com]

     If you know anything at all about the rev counter on a '94 2.6 litre 
     A6 then I need your help. It seems to me that even if you only have 
     the intelligence of an mentally challenged amoeba and you had recently 
     fallen out of a tree onto your head, you're probably still 1000 times 
     more intelligent than the average Audi dealer in the UK. This is 
     probably unfair to all the dealers with whom I have no experience but 
     the three dealers where I have in the past had work done have all 
     disappointed. I really have very little confidence in their ability 
     but because the majority of the car buying public have misplaced trust 
     in the franchised dealer network we are obliged to use them for a 
     service so that we get that all important stamp in the book. In any 
     case, what could possibly go wrong while you're changing the oil, 
     filters and plugs? Well the dashboard electronics for one...
     
     After 80K mile service the rev counter is registering too high an 
     engine speed. The problem is with the counter, not the engine. The 
     engine is NOT revving too high. Tickover is measured at 1200 - should 
     be a little under 800. 70mph is measured at 5200rpm, should be about 
     3200rpm. And so on.
     
     The dealer has now had the car for two days and cannot find the 
     problem. It has NEVER happened before, only after this service. It is 
     not an intermittent fault - the rev counter appears to have been 
     permanently recalibrated. After being assured that 'it had nothing to 
     do with the service because no electrical system was touched' I asked 
     the dealer how come the trip & odometer was now reading in km and not 
     miles. He explained that this was due to the dealer's diagnostic 
     computer 'interrogating the dashboard electronics'. Hmmmm. Difficult 
     to reconcile 'electrical system not touched' and 'interrogation of  
     dashboard electronics'.
     
     The dealer looked at the car for another day. On picking up the car 
     last night the airbag warning light is now illuminated. For every day 
     the dealer has my car another fault appears to be created. He did 
     reset the airbag warning light when it was pointed out to him however 
     (but why should I be expected to have to point this out to him - 
     whatever happened to pre-delivery inspection? It's a whacking great 
     warning light after all, easy to spot!!!).
     
     I must emphasise that the car was in mint, faultless condition before 
     the service and there's no way I can accept the dealer's assertion 
     that these problems can happen randomly. Never had this, or any other 
     problem in the last four years.
     
     Does anyone have any clue as to how the rev counter has come to be 
     reading the engine speed incorrectly? I really would appreciate any 
     advice because the dealer is talking about fitting a new ECU (very 
     likely at my expense).
     
     Please help, the car is about to be taken back in to the dealer for 
     more 'investigation'. Probably come back with no wheels and I'll be 
     told that this is to be expected on a car that's done 80K miles.
     
     Thanks
     
     Al
     95 2.6 A6
     85 Q-UR1