OK, small update. Matt has been a complete pleasure to deal with. He sourced another sensor & checked that it worked on a positive earth system. So, Matt (CNW) can supply a replacement cover for the mechanical speedo drive, a sensor mount that replaces one of the rear wheel spacers & a sensor that works with a positive ground system. It uses the 5 disc mounting bolts for the sensor pulse. They are all on the way to Ireland. I won't have a review of the system till closer to Xmas as it's a winter project for me. I'll take some pics of the install as I know you guys like pictures!!