(79-89) Fox Body Oil Pressure Sending Unit Extension Install

This part is essential for those wanting to replace an existing extension or finishing up an engine build wanting new components to coincide with their new engine. This part properly extends the sending unit away from the engine block to ensure proper clearance. It is also machined with factory tolerances to ensure a good fit from the original extension. Dimensions of this unit are:

• 3-1/4 Shaft Length (not including threaded section)
• 1/2" long threaded section
• 3/4" Stalk
• Zinc Finish

Before beginning install you will need brake clean, shop towels, high-temp thread sealer or teflon tape and an assortment of tools. Also support the vehicle as high and safe as you can get it if working on jack stands. Clean up any oil or grease buildup so you can better view the area.

1. Disconnect the oil pressure sending unit electrical connection


2. Loosen the sending unit with a 9/16” open end wrench


3. Keep a rag read to catch any oil and remove the sending unit from the extension (either use a ¾ socket with a wobble adapter and long extension or ¾ open end wrench to loosen the extension if you have the room)


4. Remove the extension and wipe any oil that might run out. Note: You may want to remove the oil filter for additional work room


5. Before installing the new sending unit extension you will need to verify that the oil metering groove is free of any burrs or foreign material. If it is needed you can lightly de-burr the opening with an appropriate drill bit then use compressed air to remove any foreign material


6. This is also a good time to clean your sending unit or replace it
7. Apply a high temp thread sealant or Teflon tape to the male fitting on the extension and sending unit


8. Make sure the threads in the engine block are free of any foreign material=
9. Install the new extension and finger tighten. Torque specs for ¼” fittings are 1 ½-3 turns past finger tight or 25 lb-ft. Note: when torquing make sure it is oriented correctly. Verify that the diagonal end of the extension is facing up and towards the 2-o’clock position


10. Install the sending unit and properly torque


11. Reconnect the electrical connection (reinstall the oil filter if removed)



INSTALL DONE! Check below to purchase an extension and similar items!

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