I assume you mean this OV-10A. http://simviation.com/1/search?submit=1&keywords=OV-10A_V2.zip+&categoryId=&filename=Y
You don't say which method you use to install downloaded aircraft. The gauge you need is in the zipfile --> http://simviation.com/1/preview-popup?fileId=18270
Simply extract it to a Temp folder anywhere on your computer. Open the extracted folder & paste the file named ov-10a.cab into your FS2004\Gauges folder.
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