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Thank you Joe. I took a picture of mine in place, and, when blown up, I can make out DIAL NO ?.-62.

When you blow up the Rochester pdf for the 6500 Senior Series gauge it shows DIAL NO 5-62 in the photo. Appears there is a choice between gear and lever driven models.

http://www.rochestergauges.com/Pages/PDFs/6500.pdf

Started to strip one phillips head, may have to drill them out.

Cal