CMP GM Dash Oil Pressure thread size?

[Bruce Parker (RIP)]

Grant, you are amazing. It appears to be a Weatherhead (Eaton) 6100X2 for 1/8" tube and 5/16-24 threads. Motion Industries lists them at $0.87 each so even if I have to splurge and get a bag of 10 I'm good. The London location might be a 5 minute drive from my office!!

[Jordan Baker]

Not sure if this will help at all.

[Bob Carriere]

....to the Guru!!!!!

[Jordan Baker]

Any chance it’s an SEA fitting or JIC one?

[Bruce Parker (RIP)]

Originally Posted by Jordan Baker

Any chance it’s an SEA fitting or JIC one?

Last night going with the Weatherhead tip I found a Chev restorer's website that confirms the 6100X2. It also talks about the original line being 1/8" steel but that can safely be replaced with 1/8" copper that is much easier to find today. My remaining question is whether 1/8" (primed) will carry the pressure from the engine to the gauge over ~10' or if I should step it up to 3/16" or even 1/4" tube.

[rob love]

The rule in hydraulics is that pressure is equal and undiminished in all directions. If it were a matter of flow, sure go bigger. But pressure...as long as it is not pinched closed 1/8 should work.

[Jordan Baker]

I climbed into the Otter today and took of a picture of the rear of the oil gauge. It has the larger tube size and long SAE fitting. The rest of the line is also larger then 1/8”. I’m wondering if there was a change that wasn’t reflected in the parts manual.

Some close up of the fittings from my Cab13. I realize the gauge is the later style but using to show the other type of fitting on the back side.