There is a very comprehensive reveiw of ICON Pro gauges and ICON Basic gauges for use with the E-TEC available at
ICON Gauges for E-TEC
http://continuouswave.com/whaler/reference/ICONgauges.html
The menu structure of the ICON Pro RPM gauge is mapped in an article at
Evinrude ICON Pro RPM Gauge User Interface
http://continuouswave.com/whaler/reference/ICON_Menu.html
Installation Instructions for ICON Pro gauges can be found at
Evinrude E-TEC ICON Gauge Installation
http://www.operatorsguides.brp.com/OperatorsGuidesAttachments/OwnersManuals_EJ/attach/Accessories/356351%20EN.pdf
Operating Instructions for ICON Pro gauges can be found at
Evinrude E-TEC ICON Pro Series Gauge User's Guide
http://www.operatorsguides.brp.com/OperatorsGuidesAttachments/OwnersManuals_EJ/attach/Accessories/766075%20EN.pdf
NMEA-2000 Instrumentation for Modern Outboard Engines explains the basics of NMEA-2000 network construction, which will be necessary for use of ICON gauges, discusses network power options, illustrates the location of the NMEA-2000 connector on E-TEC engines, discusses special functions of Evinrude-branded gauges, and compares ICON and I-Command gauges.
NMEA-2000 Instrumentation for Modern Outboard Engines
http://continuouswave.com/whaler/reference/NMEA2000.html