Chuck, I've never driven a car in my life where I thought I needed to dim the dash / instrument panel lights. I've always kept them turned all the way up to bright.
Ol' Roy's instrument panel lights also only worked intermittently (mostly never).
Rather than buy a new switch that is probably junk from China like most things today, I simply removed the switch, disconnected the instrument panel wire from its terminal, and installed it on the parking light/taillight terminal.
This way, the instrument panel lights come on full bright whenever the headlight switch is pulled out to one notch or two notches.
It works perfectly and I don't have to worry about treating it with kid gloves or hope the dash lights don't blink out.