Could be...
Larry Goodwin has a nice web site. His 325e "Ruby" has been through all the typical problems and Larry posts what he did to fix it in plane english. Sorry I should know the link. Anyway, this gauge cluster happened to Ruby. Larry said he resoldered the pathways on the printed circuit board and it's been working great ever since. My speedometer has been acting up as he describes on one of his repair posts. The pickup on the rear end is ok, next place to look is the dash. So I'll be doing this same fix with Unger soldering iron in hand.