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'77 Lance. What are these wires?

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Joined
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Hey guys, I am installing a JPI EDM-930 and it is going well. I am going to connect it directly to the wires going to the two fuel gauges and wonder if anyone can tell me about the wires coming into the gauges.

The photo is of the back of the gauges, right is right tank, left is left. There are two going to each gauge which makes sense but there is also a wire connecting the two gauges

My wiring diagram for the 930 has two wires for each sender, white for signal and black for ground. If I had to guess (which I won't do) I would guess that the poles on the gauges that are connected together would be the grounds. Would I be correct?

Thanks for any help,

Ron
 

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