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If it's original, it's probably baked and hardened to the consistency of steel. In that case, you'll probably have to remove it in pieces with a pliers.
Those grommets are cheap. It might be better just to replace it...
There looks to be a grommet through the firewall. I don't want to break the grommet. Is there a special way to loosen that grommet.
The speedo grommet on my 78' had a steel washer with spring type fingers molded into the rubber. Use a screw driver and pry it out of the hole in the firewall.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.