What's That Red Button

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It looks like it was added after the original install.

Maybe a fire suppression system activation? The only way to know for sure is to follow the wires. Or maybe press it and see what happens ;)

:thumb:
 
Agree with High Wire. If it were me I would check it with the engine running. Does the horn cause the gauge to fluctuate with engine running, if so investigate and fix, if not I would not worry about it.
 

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