Just FYI, I bought the yamaha Tach/Hr. meter and installed it on my bike. I couldn't get it to work at all... I stripped the wire, wrapped around the plug leads etc... I called Dr D and they said the directions are wrong for the WR45O, you need the wrap the lead aroung the coil/plug to get it to work.. Just thought if anyone else was perplex and feeling stupid I could save some time..