I have installed a harley compass on my Road King, using a handlebar mount. I think I have wired it correctly but cannot get it to go into calibration mode. It is stuck on west and when riding will switch between W and NW only. Does anyone know how to get it into calibration? I do not have the same wiring as the fairings. Instead of the accessory switch I wired a seperate switsc into the power cord at the gauge. Help and thanks