06-04-2017 08:40 - edited 06-04-2017 08:43
Does the gauge act is if the key is turned off, or is it energized but no data is visible?
Refer to the troubleshooting section in your gauge's operators guide and also to the wiring diagrams shown in the back of the manual. If the cause is not found, contact your Evinrude dealer.
You can give that a try but it sounds like the network data is not reaching the gauge. Visually inspect the wiring from the gauge that you can see and disconnect and reconnect things to make sure there is a good connection for each component and that no pins are bent or deformed.
If you take it to the dealer, ask that the software be updated if needed and that the engine and controls be updated at the same time. Often updating only one item can affect the other systems if everything is not the latest versions.
I had same issue and purchased I-COM Tester Kit part #0765023 for around $70. Just start at the EMM harness coming directly from the module and work your way through your linear configuration until you get to section not testing as the instructions indicate. really easy and it will save you a lot of time and headaches. The upgrade as Bill mentioned cant hurt, but I wouldnt mess around with any restart kind of activities. I found a defective harness section from my rear hub to the front hub. Good luck.