2014-2019 INSTALLATION GUIDE 3 GlowShift.com © GlowShift Gauges, LLC | All Rights Reserved CHEVY / GMC DURAMAX 9. Using a 14mm wrench, slowly thread the ferrule fitting adapter into the 1/8-27 NPT hole you just tapped and tighten until snug. 10. Loosely install the rear heat shield and tap around the ferrule fitting adapter with a hammer to make a mark on the inside of the heat shield. 11. Use a 1-1/2” hole saw to cut into the heat shield to create more space for installation of the probe. 12. Reinstall both heat shields that were removed. 13. Reinstall the factory EGT sensor using a 17mm wrench. 14. Slide the EGT probe into the ferrule fitting adapter and tighten until snug using a 14mm wrench. Note: Probe depth should be in the center of the manifold. Note: Do not overtighten the ferrule fitting. We also recommend using anti-seize on all EGT probe threads. 15. Plug the EGT probe into the EGT sensor harness and route the EGT harness up to the location of the firewall where you will be passing through into the cab. Be sure not to pinch or crimp the line and keep it away from moving parts and any direct heat sources using zip ties. 16. Reinstall the inner wheel well liner using a T-15 Torx Bit. 17. Then reinstall the wheel and tighten to factory specifications. 15. 9. 11.
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