I just currently had my transmission replaced, the cars an 84 berlinetta (digital), It went in with the speedometer working and its come out at just reading 0 constantly...The tach still works though, is there something that could have been messed with or forgotten, I really dont wanna have to go through the trouble of new dash speedo....

 

sounds like a shop did it, let them figure it out and fix it.

 

I second that, if it worked going in and doesn't work now it's their fault, could have either snapped the speedo cable internally or just not of hooked it up