Random dim lights

Hello all, as far as the headlights go, I found the bulbs themselves were different and I am getting a duplicate lens so should take care of the problem.
I am still having issues with the dash lights. In my research it shows that the light switch is grounded by the dash but when I loosen the locknut and push the switch away from the dash it makes no difference. I am wondering if I added a ground to the connector on the switch itself that this might help the ground on the dash lights and increase the brightness since many times I am told it is the ground that causes these issues? thanks