Hello again, been a while since my last posting but have been keeping up with everything (pretty much anyway). I've got a issue with my 1990 740's speedo. When traveling along at any speed over any surface it will just drop to zero. A well placed tap on the top of the dash brings the speedo back to life. Some days it won't do it at all, others it won't work for miles and then bring itself back to life. I've had a feel around behind the speed (it's quite easy to access from underneath the dash) and can't feel anything that's come loose at all so I'm guessing that it's a dry joint somewhere. Any suggestions as to what I should do? If possible, I'd like to avoid taking the dash apart but if needs must then so be it. Thanks and regards, Richard