Thought I'd upload some pictures on opening up the speedo as I imagine most people are a bit bored of staring at hex for the last several million messages... 1) & 2) This is the tool I used to prise up the edge of the crimped rim, it's a mobile phone cover removal tool apparently... looks like an electrical screwdriver with a bent tip to me. 3)Stick the opening tool in the gap between the rim and plastic (you'll need to lever against something. Just lever up a little at a time working your