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I mean how does your system get ground if there is nothing going back directly to the battery? You have power going to everything but you don't have ground going to everything.



Good question. I am not sure. I guess it grounds to chassis



Yes

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then chassis to engine



How?

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then engine to battery?



Yes, yes, and yes.

You can help it by installing a ground from the chassis to the battery [-]

For the gauges to work properly you need a good ground from the chassis to the engine.

This would be a good start.