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1998 Sunsetter LXI - Gauges Stopped Working...any thoughts? 1st time boat owner

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Hi all!  New to the boating community!  I just purchased a 1998 Sunsetter LXI with less than 300 hours on it.  It has a fuel injected Monsoon 320 engine in it.  When I dropped it in the lake for the 1st time a month ago, it ran great! All the gauges, motor, pumps, etc.  When I took it out this past weekend, I lost power to certain gauges, but not all.  My clock, depth finder still had power, but my oil, fuel, engine temp, tach, and speedometer all stopped working? I tried tracing electrical but I thing I am not looking in the right spots or missing some.  I found the fuses located in line coming off the engine, and all fine there.  I tried resetting breakers but none tripped.  I also check the fuses under the dash and nothing appeared to be blown.  Am I missing something?  Is there a wiring guide anywhere?  Please help!

Do I need a new board?  I've read that the mmdc board might be bad?  But where and what does it look like?


Thanks for any contributions.

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