there are two reds on the back of the speedo, the bottom right connection goes to the battery, I would put a 10 amp fuse in that line if there isn't one. The bottom left connection on the speedo goes to a switched power source, it turns on when you put the key in run. I would put a 10 amp fuse in that one as well. For the sender the red would go to a switched power source and I would put a 10 amp fuse in that line. The black goes to ground and the white goes to the top left connection on the speedo.
The reason that one of the red wires on the speedo goes directly to the battery is to keep the memory alive in the speedo. The other red wires don't need to have power at all times. Although they say you connect that one wire to the battery you can connect it to a constant 12 volt connection in the fuse box. You'll see a few connections that are marked battery
