If you are talking about the nut on the end of the shock rod, I find them very difficult to actually torque, as the shock rod just rotates.
I tighten with a wrench, then tap it with an impact gun to get as tight as I can.
'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)