Thread size Oil pressure Gauge

[farmerdick]

What is the thread size in the back of a 59a block on the drivers side.
There are 2 small plugs there. One screwed in horizontally
And one vertical. They are quite close together.
Will this be all I need to get a oil pressure reading? Or will I need some sort of copper wire with a probe on the end stuck down inside? Thank you.

[skidmarks]

1/4" pipe.

You just testing the oil pressure or adding a mechanical gauge to a motor in a vehicle?

For a permanent gauge, you can buy a kit that gives you a 1/4 to 1/8 bushing and a 1/8 to compression fitting . I use copper tubing then the messy nylon stuff that looks like spaghetti when its installed.

For just testing , anything that will work.

For permanent setup, small tubing prevent major oil loss if it breaks or springs a leak.

[51woodie]

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By your description the electrical sender that normally is located in the vertical hole is missing, and the horizontal hole is for the feed to the oil filter, which I would guess you don't have. As skidmarks wrote, the oil pressure gauge kits come with adapters and tubing to connect the gauge. My '46 Coupe had the electrical sender, but I wanted to have a mechanical gauge as well, so the attached picture shows how I did the install