cold start removal

[jpliddy]

hi all
can i separate my C.S. device from its fixing plate on the pump and just leave it connected to the coolant pipes as then i would be able to monitor what its doing in cold and hot on the car . i would then be able to see any movement of the centre plunger while the coolant is flowing through the stat .
my C.S. has no movement at all just now .imfaily sure this is due to a adjustment my diesel engineers made . there comments now are that theC.S. device may have failed . if thats so there will be more to just changing it for a new one as the cable has to be set up in such a way to work the advanced timing on cold start up . or do i just change the C.S. stat part and thats it ?
i suspect also my M.P.G. is not as it should be since they have just changed 6 injectors .