On Sat, 26 Nov 2016 18:27:04 +0000, ss wrote:

I have to replace a 2 gang dimmer switch, one gang operates the lights,
the other gang I havent a clue, dont even know if it is wired.
Anyhow I bought a replacement but just noticed it is a 2 gang, 2 way.

Is usable or have I purchased the wrong item.
Its the 2 way part that I am not sure about.

It would annoy me incessantly to have a two gang switch with only one
in use. Why did you not buy a single gang switch instead?