question about speedometer
 

well im having electricl problems with my bike and we think we tracked it back to the speedometer believe it or not. when we took it apart there was a lot of water inside. the rubber gromet on the back came off. but i was wondering is there supposed to be a rubber seal around the edge of the two halves of the case?

if not im gona silicon it shut.

i hope that is were all the problems are coming from becuase im really starting to get tired of this problem.