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There should be a small locating tang on the switch. I'd loosen the retaining nut a bit so you can turn the switch in the hole. When it gets to the right spot, it should go in ( from the back ) a little further. Then tighten the retaining ring and it should stay in place. A mopar key should go...

Normally that should work to tell you if the gauge is working. You may have to leave the key on for a few seconds to see if the gauge will react.

I know nothing about interior work but they sure look good to me.