Instruments on Dash go out

[bpwsross]

I have a 2004 Air Nautique SV 211 Team....when starting the instruments all work well - fuel, temp, pil pressure, speedometer, tach, etc....after a few minutes they stop working and some times even the hours guage goes out....perfect pass continues to work and gauge just fine. I am guessing there is a back ground connection somewhere...any advice about where to begin to look? Or other opinions?

Thanks