New to land rovers got myself a 2004 TD5 Es really enjoying already fitted a decat pipe and EGR bypass kit as monies allow going to get rid of the centre silencer another set of wheels for off-roading snorkel and other bits and bobs Have been mucking about for a month and have a great big smile on my face. Wish I got one years ago. I have one minor bug bear above my fuel cap and cruise control binnacles is a small round button with Tm on it can someone please tell me what it is for as i can find nothing about it, please help.