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2005 23 LSV ECU on display, gauges not working

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Hi everyone! I've got a 2005 23 LSV. I purchased it last fall and it's been an awesome boat, my wife and I absolutely love it. 

Our last trip out with it, I idled out of the marina and noticed some of my gauges (voltage, temp, oil pressure and speedometer) weren't working. Tachometer, fuel and perfect pass are working. After a short period of running the display reads ECU. I keep a tech mate pro on the boat so I hooked it up and verified vitals were OK. I did some reading and found it is likely a bad connections between the gauges and ecu, or possibly a ground. 

I am going to try to diagnose the issue this week. I was hoping to find a wiring schematic for the boat/engine but I'm not having any luck there. 

Any advice is greatly appreciated, thanks!

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