Fax would probably be the easiast for me. As far as your guages go. Black is ground,green is tach signal,yellow is ignition 12v,blue is guage lighting. If you have a digital speedo the white wire is gas tank sender(pink wire). That should get you started. There are other wies that also go to the multifunction tach(oil sensor harness,trim harness). They should just plug right in.
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