In normal speed wiper position, they go intermitant when you are stopped (ie
speedo reading less than about 5 mph) so I would say the problems are linked
and it is the faulty speedo that is causing it. On E34 it is normally a bad
earth in the cluster or nearby cabling (try banging around the dash while
driving). If you have to replace the whole cluster, there are two different
ones - one speedo goes to 240 (probably yours) and later one goes to 260 kph
(or mph equivalent) - they're not interchangable.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.