speedometer and tach stopped working at same time?

[Gusfazekas]

My car is a '95 SL500. What could cause both the tach and speedometer to stop working immediately after replacing the old battery with a new one? I looked at the positive wiring connections and don't see anything unusual. This is a struggle to remove and replace the battery in the '95 SL500 because the working space is confined in the trunk. The wires had to be "bent" out of the way to lower the new battery into the trunk cavity. Is there a fuse or a "hot" wire that connects at the battery? I assume this has to be a loose connection or I blew a fuse in the process of "jumping" the battery to start the car. The battery never went "dead-dead", just not enough juice to turn over and drive over to the AutoZone Parts store.

Any ideas? Thanks Steve