Hello M.shabbir gill,
I have used several Tamron lenses with a Contax 167MT. The MM adapter (box is marked MM program) has been around since the early '90's. Tamron claims it will actuate all the programs in the 167MT, and the adapter does cause the camera to appear to operate all the functions in the P,Tv, Av, and M modes. However, check in the thread with the heading, "Please explain the difference between AE and MM lenses". I posted a reply about why non MM lenses, or the Tamron MM adapter, may not give proper exposure in the P or Tv modes.
The camera body can sense 2 different positions of the MM tab. The MM tab on the Tamron adapter obviously only actuates 1 position, irregardless of the lens you have mounted.
There's no guarantee that any Tamron lens diaphragm will behave exactly like the linear diaphragm introduced on the MM lenses.
Any error, I believe, will be towards overexposure. The only answer would be to shoot some slide film which has limited latitude at all f/stops with the particular lens(es) that you are interested in using. It seems to be a lot easier to just shoot with the Av mode.
Best wishes with the Tamron adapters.