I have used Smiths instruments with a magnolia face which I purchased from Europa Specialist Spares. I now have the tacho and fuel gauges working but need a little advice on the speedo. This came with a XS108B3PAL2 proximity sensor which didn't come with any instructions. I'm fairly confident on mounting this close to the bolt heads on the prop shaft but wondering how I should connect the 3 wires. The brown wire is positive, which I'm guessing should go through a fuse. The wires are all very thin and I'm thinking of something like a 1 or 2 amp in line fuse. I've done some on line research but can't seem to get any answers. Can anyone out there offer some advice. ?