I have a 1969 evinrude 55hp that I am trying to connect a tachometer to. The problem is on this<br />model it has a cd amplifier and the original <br />tack ran off the amplifier on a gray wire but the tachometers of today will not run off the cd <br />amplifier and I am trying where to connect the wire from the tachometer to. I have my tachometer set on 6 poll. I would be greatful for any help.