My 1994 f150 5.0L manual tranny 4x4 spedometer does not work anymore. It was bouncing around and now it just stop. I replaced the speed sensor on the rear differential and nothing happened. Then looked at the connector that plugs onto the sensor and it was all corroded so i replaced that. Still nothing. Anyone have any idea? Is that the only speed sensor?

 

There is a fuse for the speedo in the fuse box under the dash if I'm not mistaken. I would check that as well.

 

Find the RABS II module (don't recall off hand but should be rabs II), its behind the glove compartment and unplug it, test drive to see if the speedo works right with it disconnected.

If its RABS I, the module is located to the right of the brake pedal.