same as mine but mine is automatic so it will be the same. very simple job.
pull engine cover off
locate sensor - near the front, slightly to the drivers side, round thing with connector on top, should be green plastic in colour. I think the colour relates to the exact sensor fitted so check the colour of yours before going to get one, mine was about £8 from mill autoparts, I think eurocarparts stock them too, easily available.
this step not crucial but helps to stop mess - syphon as much coolant out of expansion tank as possible, replace lid, release screws holding tank -and turn it so what coolant is left is not able to flow out of the pipe - I did this I guess if you don't you will get coolant coming out of sensor hole and you will then have to wack the new one in quickly to stop the flow.
remove plastic retaining clip holding sensor in, pull upwards - fit new. worth fitting new rubber washer as well.
replace connections & refill coolant etc.