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Re: dash cluster plug question..
Most aftermarket gauges have three wires, 12v+, Ground and Sender but sometimes there is no Ground.
In your case, you would need a switched 12v+ which would be one of the tan wires. You'll need a meter or test light to figure out which one. When you find this wire, the other tan wire would be the one to hook to the Sender on the gauge. You might not have a Ground depending on if the dash light is grounded through the case or is stand alone. I have seen both ways.
The wire you have running from the fuel tank just connects into the spot on the fuse block and then routes up to the non powered tan wire. The fuse block just made it easier for the factory to wire things up without having to have one really long wire between the dash and the gas tank. Think of where it connects into the fuse block as a "splice".
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