fitting a TC switch to the 2.2 vectra is very easy. Its only 3 wires that you need to fit to make it switchable, a brown wire for earth which you can tap into pretty much anywhere, a grey with yellow stripe wire to light the switch up whic can be tapped into by the other switches and the other comes from the passenger footwell which is black with a red stripe. In the passenger footwell there is 3 plugs, (see pic below) and there is a loom which runs BY these plugs and not to them, the wire needed is in there.
the wires circled in red are the TC switch wires
