hour meters and speedo stopped working?
 

Hey all. This is weird and hoping someone can give some insight as to why. This actually happened last summer and my marina never got to it before it went back in this year. The only thing done last year was a new Garmin plotter. I assumed they disconnected something when they installed it but yesterday they opened the dash and said all the gauges have juice to them. The tachs do work. He says the gauges need replacement or rebuilding. Does this sound right? All three at the exact same time? I don't think the speedo is related to the hour meters? Any thoughts? Thanks.