Unless you are certain that one gauge is correct an the other incorrect, I would test with a third gauge.
cojhl2,
That CAT gauge was a tested gauge, know to be good. thanks for the reply.
Biggastractor
If you can't find original, 2814A, 2-13/16" gauge, is updated to 2H3129 or 4B2796, 2-3/16" gauge, and 4B8392 or 4B6214 bracket and 2 9F9327 screws.
Josh, Thanks for the info.
Biggastractor
had a few done here http://www.gaugeguys.com/