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Dmaxin 10-13-2004, 04:45 PM I have a autometer phantom pyrometer that am going to install but am unsure what size drill bit and tap i need for the probe? I know its a 1/8NPT thread but dont know the diameter of the probe. Anyone have the autometer gauges know? Thanks hoot 10-13-2004, 05:22 PM READ THIS (http://www.dieselplace.com/forum/forum_posts.asp?TID=946&PN=3) gearhead 10-14-2004, 10:18 AM drill size is letter "R" or a .339 dia. Edited by: gearhead Trippin 10-15-2004, 04:00 AM Want to do something really crazy? Look for a NPS tap instead of a NPT tap. The difference? National Pipe Tapered vs National Pipe Straight. With the NPS tap there is no danger of tapping too deep. http://www.dieselplace.com/forum/smileys/smiley9.gif | ||