Yamaha to Lowrance

[Bloggsy]

A mate of mine has a Yamaha 70 hp four stroke and wants to be able to display engine and fuel data on his HDS Live. There is no nmea 2000 backbone fitted to the boat but he does have 2 Yamaha CY8 Multi Function gauges. So my question is what is required to connect the Yamaha to a nmea backbone is there a loom to go from the back of the gauges or direct from the engine? I understand that a nmea backbone will also have to be fitted and are you able to keep the existing Yamaha gauges as well.