rustychevy- Ah, I always like those! Nice, clean three-box lines. I never had the column apart on one of those, not sure whether it`s all that reparable or not...sorry. I`d *tend* to think that it is, even if a new indicator has to be fabbed out of some other gauge needle or somesuch.
Noting that I`d be *VERY* polite about it, I`d approach this whole thing confidently from the perspective of "hey, it`s too bad, but yeah [stuff] happens on older cars...of course, I always knew you`d fix it free-of-charge, all I care about is that the repair looks oe and doesn`t take too long." IME if you have that viewpoint firmly in mind it`ll come across the right way as long as you don`t call `em stupid or anything like that (and it sure doesn`t sound like you would).
Just don`t go into it with any uncertainty about who`s responsible....they are. Period. Even if you signed off on some fine print that says they get a pass on any damage they do (sure hope they`re not that kind of shop), remember that *somebody*...the owner at least...can do what we`re discussing *if* he wants to. There`s no "hey, we CAN`T fix every little thing.." Sure they can, they can give the store away if they want to, and responsible people would want to make this right.