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Hello, my name is***** will assist you.
First, look at the connections on the back of the switch panel and make sure that there is no corrosion on any of the pins. then locate the brain box in the boat and inspect all of the connections for corrosion and ensure that all are tight. If nothing can be located, you wil need to replace the switch panel.
The push button on the dash is the switch panel. The brain box, could be located inside the engine bay or in the console.
Yes that is it.
No all of that comes directly from the engine.
Look on page 21 or 26. That is the wiring diagram.
Did you see the diagram?
The tach and speed may be on the way out. They are 16 yrs old now.
Did you see the diagram I sent? The wire colors are in it. You could use an ohm meter to test it.