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Hmmm...Kevin, don't think that the tachograph equipped truck tractors are rare, the (July 1972) 9-2320-260-20 manual for the m818 has a 20-page section on it, I got my unit from a parts M52A2 and we have just seen postings by M1075 with his M911 HET truck tractor tachograph.
The clock is spring...
Price sounds about right, but I haven't been shopping.
The large instrument you described is a tachograph. You load it with a paper disc and get a permanent record of your trip with driving habits...