The additional gauge is a Stewart Warner 82303 Fuel Level Gauge. The reason I installed that gauge is because I installed a custom built Fuel cell, and the sending unit we installed was a Stewart Warner 240 ohm sender (which wasn’t compatible with the stock 90 ohm GM gauge.) So we had to retrofit the original Gauge cluster to accept this after market gauge; it made a very nice addition.
I have the original Box and Instructions and have attached an image of them
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