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i just purchased all aftermarket gauges for a progect boat i have. I have a question on wiring. they are beede gauges and my question is this. the back of the gauges have letter to label the posts. I know what that the g is ground, but what is I, S, And O. The gauge fastener jumps g to o. Does that me o isnt anything? I think i is ignition, and s would be sender, correct?
 

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You've got it dead on. All The gauges I've seen mainly have Three Posts

One for ground

The second for the sender

The third for ignition

Wire it up and you shouldn't have a problem.
 
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