ND MX-5 Miata Tapless Adapter

THANK YOU for purchasing the ND MX-5 Miata Tapless Adapter from CravenSpeed. This product is made from the highest grade materials, and is guaranteed to be free from defects.

Parts Included:

  • 1x Tapless Oil Adapter
  • 4 ea 1/8" NPT Pipe Plug

Tools Required:

  • Thread Sealant (Threadlocker is NOT acceptable)
  • Any gauge components or related parts
  • 12mm Socket and Ratchet Wrench
  • 2 Adjustable Wrenches (Crescent)
  • 3/16 Allen Key
  • Floor Jack
  • 2 Jack Stands
  • Wheel Chocks

NOTE:  This install may seem a bit intimidating at first glance, but honestly it is fairly simple and straightforward. Just read through the instructions completely beforehand and take your time. If you are unsure of your mechanical abilities, please seek out a friend that can assist you or a professional shop that can complete this install for you. We recommend that you perform this upgrade when the vehicle is cool, as you’ll be in the vicinity of potentially hot engine components and will come into contact with engine oil.



Let's get started


    1. We will be going underneath the car for this installation, so let’s begin by placing wheel chocks behind the rear wheels and setting the vehicle on jackstands. Your work surface should be solid and as level as possible. Do not perform this installation on uneven, soft ground or any surface where stability could potentially be an issue. Above all, stay safe!


    2. Once you have the car in the air and have determined that it is safe and stable, slide underneath the vehicle with your 12mm socket and ratchet wrench. We will need to remove the aluminum panel just aft of the front wheels. There should be (9), 12mm bolts around the perimeter of the panel attaching it to the car.

    IMG_6205 Circle.jpg

    3. The factory oil sensor is located just forward and above the oil filter. Reach up and disconnect the wiring plug from the sensor.


    4. Using an adjustable wrench, loosen the sensor from its mount, but do not completely remove just yet. Included with the Tapless Oil Adapter, you should have (4) ⅛ NPT Pipe Plugs. You will be using one of these to temporarily plug the sensor port while you prepare the factory sensor onto the Tapless Oil Adapter. Have the ⅛ NPT Pipe Plug at the ready along with a 3/16 hex key and quickly swap out the factory sensor for the ⅛ Pipe Plug. You should not have to add any sealant to the plug since it’s only temporary and oil drippage during the swap should be minimal.


    5. Take the removed factory sensor to your workbench, clean it’s threads, and apply your thread sealant. Give the remaining (3) NPT ⅛ Pipe Plugs the same treatment and install them into the (3) ports around the sides of the Tapless Oil Adapter.


    6. With the (3) NPT ⅛ Pipe Plugs in place, thread on the factory sensor and tighten with the two adjustable wrenches.


    7. Slide back underneath the car and swap out the temporary ⅛ NPT Pipe Plug with the Tapless Adapter assembly. The threads on the Tapless Adapter are a tapered thread, so do not over-tighten them as you risk splitting the mount on the engine case.  Secure with an adjustable wrench and reattach the plug wiring.

    8. Proceed with the installation of an oil pressure sensor, oil temperature sensor, or a combination of the two. You should be able to position the Tapless Oil Adapter so that the ports you require are easily accessible and the gauge sending units are out of the way of any engine components. Remove the ⅛ NPT Pipe Plug from the desired position and install the gauge sending unit/sensor in its place utilizing your thread sealant.

    IMG_6215 Yes No.jpg

    Please Note: Some oil temperature sensors are not compatible with the CravenSpeed Tapless Oil Adapter. The sensor used must have a small diameter probe section as shown in the referencing image. If you require the smaller style, we do have them available separately for purchase.

    9. Once all of your sensors have been installed and any related gauge wiring has been affixed out of the way of any moving engine components, turn on and run the engine for a minute or two to check for leaks and to ensure that the gauges are functioning properly.

    10. Re-install the aluminum panel, remove the jack stands, lower the car, and remove the wheel chocks. You’re done!