What is the thread size on the back of oil pressure gauge??

67Dart273 said
Ya know this board is a two way street. When I or someone else suggests you post a photo and or post a brand name/ model of whatever it is that you are trying to work with, WHAT THAT MEANS IS you have a job to do. I could sit here and guess all night long. **** for all I know it might be METRIC. No, German, U.S. and Japanese pipe fittings are NOT the same.

In this day and age, it could be any of those + something proprietary

I understand that Del, sorry I dropped the ball on this one. My gauge is literally exactly like the picture you posted above, that's the exactly make (Equus) and more than likely the same model. Equus gauges are the only ones who use those thread on fasteners to hold the gauge in place instead of the normal metal bracket and nuts.