GlowShift 1/8-27 NPT Drill & Tap Kit for EGT Probe Installation — Size R HSS Drill & 1/8-27 Tap

GlowShift 1/8-27 NPT Drill & Tap Kit is a purpose-built drill-and-tap set for cutting and threading 1/8-27 NPT holes in exhaust or intake manifolds to install EGT probes, boost sensors, or compression fittings.

When fitting an exhaust gas temperature (EGT) probe or a boost sensor directly into a manifold, accuracy and the right tools matter. This kit gives you a matched drill bit and tap sized to create clean, correctly pitched 1/8-27 NPT threads that accept GlowShift sensors and standard compression fittings. It’s designed to save time, reduce fitting errors, and give a professional thread for a reliable sensor seal.

How does this kit make installing an EGT probe easier?

The kit supplies a high-speed steel drill and a dedicated tap sized for 1/8-27 NPT threads, removing guesswork about drill diameter and thread pitch. Using the right geometry reduces the chance of misaligned holes and stripped threads, which helps preserve the manifold and ensures the probe seats correctly.

• Size R high-speed steel drill bit with 118° point for controlled entry.
• High-carbon tap cut precisely to 1/8-27 NPT thread pitch.
• Matched pair designed for GlowShift probes and compression fittings.
• Reduces rework and risk of cross-threading during installation.

Which materials and engine locations is it suitable for?

This drill-and-tap set works for many cast-iron and mild-steel manifold applications where 1/8-27 NPT sensor ports are required. Soft metals and some alloys machine differently, so use appropriate cutting fluid and steady drilling technique to avoid chatter or heat-related damage.

• Intended for exhaust manifolds and intake runners compatible with 1/8-27 NPT sensors.
• Use cutting oil for aluminum or softer alloys to improve thread finish.
• Not recommended for hardened or coated surfaces without professional assessment.
• Drill speed and steady feed improve hole accuracy and tap life.

What are the tool specifications and compatibility?

The drill bit is a Size R high-speed steel cutter with a cobalt finish and a 4-3/4" overall length, finished to a 118° point for reliable starts. The tap is high-carbon steel cut to 1/8-27 NPT threads, matching GlowShift EGT probes, boost sensors, and common compression fittings for a proper seal.

• Drill: Size R HSS with cobalt finish, 4-3/4" overall length, 118° point.
• Tap: High-carbon material, threads to 1/8-27 NPT specification.
• Thread fit: Compatible with GlowShift EGT probes and boost sensors.
• Included geometry reduces the need to select separate drill/tap sizes.

What support and warranty come with the kit?

GlowShift includes a one-year limited warranty and free lifetime technical support with every purchase, plus a 30-day return window. If you have installation questions or concerns about fitment, their technical team can advise on best practices and compatibility before you begin cutting threads.

• One-year limited warranty from GlowShift.
• Free lifetime technical support for installation help.
• 30-day no-hassle returns policy.
• Documentation and customer service available for fitment questions.

Who is this for? If you install temperature probes, boost sensors, or custom fittings into manifolds and want a matched drill-and-tap combo to create correct 1/8-27 NPT threads, this GlowShift kit is made for DIY mechanics, performance shops, and tuners. It’s particularly useful for anyone fitting GlowShift sensors who needs consistent thread quality and wants to avoid common drilling and threading mistakes.