I got the harbor freight kit to test oil pressure. What is the thread size of the oil pressure sensor? I have seen mixed answers of either m12 1.5 or 1/2 20 unf. Since they are both similar in size, maybe they both work? My kit has the m12 size but not the 1/2. If it wont work, then where can I get the correct fitting? I don't have the tools where i am now for drilling and tapping.

 

I can confirm M12 1.5.