Can anyone tell me if the instrument clusters are interchangeable between an AT and Manual and years for a 94 sidekick?

I don't see why they wouldn't swap, but I'm not 100% certain 

I am pretty sure the dashes are the same from 89-95 (both 2 and 4 door), so I would guess the clusters will all interchange.  There may be some variations in the pinouts of the wiring harness plugs though.....since there are slightly different layout options in the clusters.
The only differences I know of that may cause some issues......the 89 and 90 clusters do not have a VSS in them, so I would stay away from those years.
I can't think of any issues that would cause an AT cluster not to work in a MT trackick and vice versa though.

 I've done the auto-man swap, the whole drivetrain/wiring thing before... PITA!! You can use the auto cluster in the manual, but I don't believe you can the other way around.

THX all for the info.  I will be changing one out soon and have not found any specific info any where else. 

an update on my dash cluster changeout.  Idaholwb, I think you got it right.  I obtained two dash clusters (one shows only 3,456 mi.) and tried to change out.  My auto equipted 94 has two 2 inch or so plug ins, and a third small one with nothing plugged in.  The dashs I got had only one two inch plug in.  One good thing is, I got my check engine light problem fixed for ever.