1150GS Tacho
 

It has died completely. I've checked the wiring that isn't lost in the loom and it looks fine but I don't like the volt reading off the plug between the tacho and the Motronic box. - + and - leads are as expected but I'm also getting 13.4v from the signal wire with the engine running.
Anybody have an idea? I'm thinking it could be a transistor in the Motronic which would probably have blown the tacho as well?