Amp ground wire?

[Kawaii]

I'm using a Metra 70-8113 harness for Toyotas with factory amps and I'm trying to install it with a pioneer unit but the Metra harness has 2 ground wires, one for chassis and one for amp ground. The black chassis ground from the harness should go to the black chassis ground wire coming from the Pioneer but there's no black amp ground wire coming from the Pioneer, so where should I connect the black amp ground wire from the harness to?

TIA

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[CrossoverOre 10+ year member]

tie the black and the black/white on the metra harness together and connect both to the pioneer.