I have a fuel pressure guage form glowshift for my 03 cavalier and I don't know where to install the fuel pressure sending unit they sent me. Does anyone know?
Show us a picture of what you have, but there's a nipple on the return line of the fuel lines going to rail. It's right by the driver side of the valve cover near the power steering pump. I can't remember the size of that thread off-hand but I know the information is on here if you search for it.
"In Oldskool we trust"
That's right - good thing you don't have an 02 fuel rail!
"FRIENDS DON'T LET FRIENDS DRIVE STOCK"
It is a -3AN fitting. Youll have to use a valve stem core remover to take the core out first before you hook up the proper adapter.
Currently #4 in Ecotec Forced Induction horsepower ratings. 505.8 WHP 414WTQ!!!
Currently 3rd quickest Ecotec on the .org - 10.949 @ 131.50 MPH!!!