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Sometimes these can got stuck on pretty good from sitting over the years. A few ways it can be installed, first look for a plastic ring where the gauge meets the panel, also check and make sure there are no tabs on the housing for the gauge, have seen a few where you have to push in on the tabs and then it will release the gauge. It is possible it is just stuck as well... IF you can send a photo of each side I might have some more ideas... Robert