Figure about $50.00 to $100.00 each on average. Some of the gauges may bring a bit more, depending on the brand and age. There are still folks building with round gauges.
There's almost always some kind of market for used airplane parts. Might not be exactly the market you're expecting, but you can never tell who might be looking for some specific used component until you advertise it somewhere.
I am almost finished with an amazing totally state of the art all glass panel. That being said, I still drool when I see a well done old school panel. There is something about a panel full of round instruments.....
There will always be a market for the old school stuff.
