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Its a catch 22. Some people won't touch it with a tuner and others that know about it will love it. Try and sell it on some of these sites and see what happens.Word of mouth sometimes works good.
Are you selling it yourself or trading it in? For a trade in, pull it and sell it elsewhere. The chip won't get you any extra money. Neither will the gauges.
If you're selling it yourself, you'll have the opportunity to explain why the gauges are there and why they're a must for running a chip. That might actually help with the sale if you can educate the buyer. (especially if he test drives it)