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I just got a boat with twin 2006 f-250's. The tachs and gauges worked for about two trips. Now the tachs just show a horizontal line and the fuel speed gauge shows zeros. When I disconnect the white plug from the speed fuel gauge the tach gauges start working. I checked connections and all look good. The system has 3 square gauges total. Last trip to the boat the fuel gauge is showing empty. Was at about half two days ago. Going to stick tanks next trip down. Need a wiring diagram for this system.
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Here is the Command Link gauge manual, check settings in menu are correct.
The fuel tank sender may be bad causing fuel gauge to not read properly.
The speedo pickup hole in front edge of gearcase may be plugged and need to be cleaned.
Command Link Installation Guide.pdf
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