2006 Nautique 211 Analoge Guage Issue

I have a 2006 Nautique 211 and I am having issues with the analog gauges not working. Currently the engine temperature, oil pressure, and fuel level are not working. With the 3 gauges not working I am guessing that it is not a sender issue but rater I have a loose/ broken wire somewhere. I have pulled the dash and nothing looked suspect. Do anyone have a wiring diagram for 2006 Nautiques or any suggestions on trouble shooting before I haul it in to the repair shop?

Thanks in advance,
Aj