The Tornado's SHAR according to my research and some article in FlightGlobal
from the 1980ties was made by Litton and yes, this also uses/used mechanical
gyroscopes. This system is quite similar to the Litton LTN-51 inertial platform a
French seller wants to sell on eBay right now (search for "centrale inertielle" on
eBay). Nevertheless: Thanks for viewing and for the answer!