Yeah, just like DRC says there are 3 inputs on the AM guage (ign, ground, signal). You can use the the tan wire on the factory dash cluster connection for your signal on the gauge. You can use your existing tank sendor (assuming it is the factory or aftermarket one), you just have make sure the gauge and sender are the same ohms range (factory camaro sender is 0-90 ohm).
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts