I have a oil pressure gauge I'am putting on my 2004 Cavalier, the only part i'am stuck on is the t fitting that you use that hooks onto your sender. I went to advance and napa and they cant help me because they need to know the thread sizes i guess on the engine block and the one on the gauge that hooks into that fitting, If anyone can help me please i would really appreciate it

When the engine is cold take a rag out to your car and stick it under the stock oil pressure sensor. Pull the sensor out and clean up the little bit of oil that may come out. Take that sensor to NAPA or AAP with you and well as the Oil Pressure guages sending unit.

where is the sensor located?

do a search in the performance fourm , and also the boost fourm

you can tap the side of the head , the size of the adaptor is given in a post in 1 of them fourms

Lee Thomas wrote:where is the sensor located?

If you filled out your profile I might help you.