The guage cluster is a single assembly and is not repairable at the shop if a single guage isn't working. Why they state they're "sending it out" is a mystery as they should have just ordered a replacement.
Realistically, it's probably just a case of the needle having been pressed onto the shaft at the wrong index during manufacturing. If the values were all correct minus the offset value, they could simply have pulled the needle pointer and reinstalled it at the new index value. This is what an end user needs to do to install those "fancy" aftermarket dash overlays you can get on ebay anyway. That's why they clearly state "MARK DOWN THE POSITION OF THE INDICATORS" before you take it apart.
Maybe it's because there are so few sold in the "Great White North" that the spares are hard to come by? eh?