Oil Pressure Sender Fitting

[Dragcity]

Does anyone know the fitting size for the Oil Pressure sending unit that is affixed to the block? I need to pick up a Tee to put in there.

Your help will save me one step, and a day...

My matching Stewart & Warner Volt gauge will be delivered on Thursday, the one that matches my mechanical oil pressure gauge...

[RF Overlord]

The factory switch (it's not a sender) is 1/4" NPT.

[Dragcity]

Thanks.

Oh yeah. On = 68 Off = 0

That be a switch....