How do I bypass instrument gauge dimmer and put on toggle switch

You don't really need a toggle. Take the tan wire off the dimmer and splice it into the park lamp circuit.

It also might be that the panel is filthy inside and needs to be cleaned, you may have 1 or 2 bulbs out, or need brighter ones. "Might be time" for LED bulbs There was a couple of threads on this just the last couple of days.

The recommended bulbs are Philips brand 194 LED