The adapter has too small sealing area, so o-ring(or copper washer) will not seal correctly.Compare with bigger correct sealing area on another adapter(SILVER PIC).No good, Seller must change the product.

The GlowShift M18 x 1.5 Male to 1/8-27 NPT Female Gauge Sensor Sender Thread Adapter Reducer is a thread adapter designed to convert the size of the threads on various vehicle sensors, making it useful for installing gauges or sensors in a wide range of automotive applications. This adapter is commonly used in situations where there is a mismatch in thread sizes between the sensor sender and the vehicle’s existing mounting port. Below is a detailed review based on its features and performance:Pros:High-Quality Construction:The GlowShift thread adapter is made from durable materials, such as high-quality aluminum or steel. This ensures that it can withstand the harsh conditions of the engine bay or undercarriage, including exposure to heat, moisture, and vibration. The robust construction offers longevity and reliability for the long-term use of your gauges and sensors.Precise Thread Sizes:The adapter provides a reliable connection between the M18 x 1.5 male thread (commonly found on many vehicle sensors and senders) and a 1/8-27 NPT female thread (standard for many aftermarket gauges). This makes it ideal for situations where a sensor or gauge needs to be installed in a port with a different thread size. The precision of the threads ensures a secure and leak-free installation when properly tightened.Versatility:This adapter is versatile and can be used in a wide range of applications, including temperature sensors, pressure senders, and boost or oil pressure gauges. It is compatible with many vehicles and aftermarket gauge systems, making it a popular choice for those looking to customize their setups.Simple to Use:The adapter is easy to install, and its simple design ensures that anyone with basic mechanical knowledge can quickly fit it onto the required sensor and port. This convenience saves time during installations, particularly in confined or tight spaces under the hood.Prevent Leaks:One of the most important features of any thread adapter is its ability to prevent leaks. The GlowShift adapter offers a secure and tight seal when properly installed, ensuring that fluid or gas (depending on the application) does not leak out, which is crucial in automotive applications where leaks can lead to serious issues.Affordable Solution:Compared to replacing entire gauges or sensors to fit different thread sizes, this adapter provides a much more affordable solution. It allows for easy integration of sensors or senders into systems without requiring you to buy new parts, saving money and effort.Cons:Limited to Specific Thread Sizes:While this adapter is useful for applications requiring an M18 x 1.5 to 1/8-27 NPT thread size conversion, it will not work with other thread types. Those looking for adapters for different thread sizes or more customized fittings may need to purchase additional adapters or solutions to meet their needs.Requires Proper Installation:Although the adapter is simple to use, it requires proper installation to avoid leaks. Over-tightening or under-tightening the adapter can lead to damage or inadequate sealing, so it’s important to follow manufacturer instructions carefully when installing the adapter.Compatibility with All Applications:The M18 x 1.5 male to 1/8-27 NPT female thread adapter is widely compatible but not universally so. Custom sensor setups or uncommon thread sizes may require different adapters or modifications, so it may not be a one-size-fits-all solution in all applications.No Sealant Included:Some users may prefer to have a sealant or Teflon tape included for extra sealing, especially if the adapter is used in high-pressure or high-temperature environments. While the threads themselves provide a secure fit, adding a bit of thread sealant can be recommended in some cases to ensure a completely leak-free installation.Thread Size May Not Be Ideal for All Gauge Types:While the 1/8-27 NPT female thread is quite standard for many aftermarket gauges, certain specialized gauges or sensors might require different thread types, which means you may need additional adapters depending on your particular setup.Conclusion:The GlowShift M18 x 1.5 Male to 1/8-27 NPT Female Gauge Sensor Sender Thread Adapter Reducer is an affordable and effective solution for those who need to adapt different thread sizes between automotive sensors or gauges. The high-quality construction, precision fit, and versatility of the adapter make it a valuable tool for DIY mechanics, enthusiasts, or professionals working with gauge installations.Its ability to offer a reliable and leak-free connection between different thread types ensures that it can handle demanding applications, such as temperature or pressure sensor installations. However, it is important to ensure proper installation to avoid issues like leaks, and its compatibility is limited to specific thread sizes. For users with the right setup, this adapter is a cost-effective solution that allows for quick, easy installation of sensors and gauges without requiring expensive replacements or custom parts.

This adapter is provided with an O ring it will not ever seal properly for a high pressure source. You can't substitute a copper sealing washer because the fit is way to sloppy. Find a part that comes with a proper metal sealing washer! !!

The temperture sensor fits well with the item. No issues

I bought this product because I needed to connect an oil pressure gauge to my car in order to run a test. It was listed as being the exact size that I needed. However, when I screwed it into the car, it was somewhat of a loose fit. When I started the car, oil gushed out at a high rate, making it impossible to verify the correct oil pressure.