Hi, Yes you do have to take the speedo out. It is held on by a large plastic O ring. It is quite simple but the capacitor has to be sweated in so it is best to take the speedo out to give more room for the process. Yes you are right, the read out is susceptible to damp conditions. Mine sits outside under a cover at the moment til I get round to building a garage. Looks pretty sad at the moment but still using it in the snow. Can you help please, how do I get the icons to go in the text box? I click the circle but click and drag does not work.