67 Barracuda headlight switch wiring?

For 1967 the OEM switch didn't have that ground terminal or wire. Its on all replacement switches so the one size fits all. Might not help much but cant hurt to add a ground wire there. Best place the add a ground wire on this inst' panel is on the pot metal inst' housing itself. I attach with ring terminal at lower one of the 3 screws at center gauge pod.