Most dash components are self grounding usually. What ground wires for "dash things" are you talking about ?
What ground wires for "firewall things" you are talking about? Not many of that type either.
What vehicle?

You can't have too many grounds but what you are doing sounds a little odd so far.

Last edited by bartamos; 12/08/2022 5:09 AM.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn