[Dave Colangelo]

Check the fuses...

Could be the sensors, if you have access to some electrical diagnostic equipment you can sort it out. I dont know the reading off hand but the sensors should have a nominal internal resistance that you can check with an ohmmeter. If you have access to an oscilloscope (lots of cheap options out there these days) you can confirm, if the engine runs, that they are outputting appropriate square waves. You should see a smaller pulse width as the RPM's get higher.

From the description it sounds like they are either not getting appropriate power or signal (or both).

Side note, the ODO is driven by a small motor inside the speedo unit, since neither are working it sounds like your not getting signal to the whole unit. In some cases the ODO can stop working when the small plastic drive gear shreds but the speedo will continue working.