Adding mechanical oil pressure gauge

[Xticee]

My in-dash oil pressure gauge and alarm have started wiggin out on me and I want to install a mechanical gauge in the engine compartment of my'03 21 xti. After reading postings from others with this issue I'm hoping it's just the sending unit or connection, but I want to be sure and monitor what's really going on. Engine is a carbed 310 hp vortech. Anyone know what size fittings I'll need to tee into the stock oil pressure sending unit?

Thanks!

Jay

[pup]

the oil pressure sensor thread is 1/8 npt. you can get fittings at any hardware store.

[Xticee]

the oil pressure sensor thread is 1/8 npt. you can get fittings at any hardware store.

Thanks pup!

[electricjohn]

I needed either 2 tees or one X fitting. Have not been in the boat since November so I don't remember. I needed openings for the sender, oil pressure switch, and the mechanical gauge. IIRC, I used 2 tees, with a male thread on the top of each.