1978 stingray type 1 preamp wiring

1978 stingray type 1 preamp wiring

i NEED SOME HELP WITHT HE CORRECT WIRING FOR GROUND WIRES WHEN REPLACING THE PREAMP. THIS ONE HAS THE TRS INPUT JACK ALSO. I HAVE A DIAGRAM FOR THE MAIN WIRING BUT NOT UPGRADE TYING THE GROUNDS TOGETHER.

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