I have striped the loom, only to find lots of problems! I've never seen a loom like it, it seems to have been made up of all the shortest bits of wire they could find, no wonder Triumph said check the loom first. It's full of hidden joints and some of the earth joints are getting hot inside the loom, (probably Triumphs way of keeping the loom dry, ha ha )? I spoke to Triumph about a sensor and they told me they have only ever sold one and it's very unlikely to be the problem, much more likely to be inside the loom, hence why I striped the loom. Up to date, I have put the loom back leaving it open for now, (after making several repairs to stop future problems). I don't think that the loom is causing this problem, apart from the corrosion that I found inside the 20 pin instrumental panel plug, which uses 17 pins. The purple wired pin had corroded off, which does a constant power to the speedo, it may have caused something inside the speedo, which unfortunately is a sealed unit! I found that if you disconnect the RPM sensor it does not stop the gauge sweeping, so if the speedo works on the same principle it's every possible chance it may be the speedo, but as I said its a sealed unit, very difficult to look inside., also the starting sequence is wrong, its not bringing the warning lights on when it should? Another problem is that way back when the bike was still in warranty, Triumph had the bike in and put scotch lock type testing connectors on numerous wires, which are falling off everywhere leaving exposed damaged wires and where they are on tight they are cutting the wires through years of vibration! But hey, these things are sent to try us as they say. When I finally get to the problem I will let you all know, I'm not one to give in. Pictures to follow.