I've received a number of email requests about pyrometer installation, and thought I should repost the tech page we have that explains the process.
http://www.thedieselpage.com/members/drillman.htm
Since we first published our gauge installation article in January of 2002, I've seen a number of magazine product reviews for Duramax power products that follow this same exact recommendation. In addition, my own pyro installation done in late 2001, still works great.
MP