CMP GM Dash Oil Pressure thread size?

[Jordan Baker]

Here is the information for the Otter oil gauge.

[Bruce Parker (RIP)]

Originally Posted by Jordan Baker

Here is the information for the Otter oil gauge.

I bet the Otter and Fox gauge not only adjusted for pressure but allowed for a larger diameter line. Jordan, is the Otter line 3/16" or 1/4"?

[Colin Alford]

Bruce/Jordan,

I have done some more reading.

Oil pressure gauge pipes and fittings can be found at group number 1.519 in the Chev/GM parts lists.

Attached are two examples of the listings for 216 engined vehicles.

Pipe Assy 592818 started to be used upon the transition to individual round gauges.

The other tubing, union and nipple were used with the early instrument cluster.

The mentioned “Tubing unit” seems to be a parts listing of bulk coils of tubing for workshops. ( image attached)

Info regarding C60X to follow.

[Colin Alford]

While the listings for the 216 engined CMPs were easy to follow, the listings for C60X are not.

C60X-01 (October ‘42) lists 1/4” (upper) and 3/16” (lower) tubing. None of the listed fittings are the same as those for 216 engined CMPs.

C60X-04 ( January ‘45) lists 1/8” tubing, but the other fittings have the same part numbers as those for the larger tubing (a mistake?)

I am not sure what conclusions to draw, but please have a look at group 1.519 in your Fox and Otter parts lists.

[Jordan Baker]

Here is the group 1.519 from the Otter parts listing.

It’s 1/4” OD tubing to the gauge. I suspect the line in my Otter is original. I can’t prove it but all the rest is still very much original and unmucked with.

I also found the below picture from the internet. It was a page that identified differences between Chevy and GMC dashes. The gauge on the left was for Chevy and the gauge on the right is for GMC. The difference was the Chevy 216 vs GMC 270.

[Jordan Baker]

Here is an NOS glass (GM 1566971) for the Otter and others that shared the same part number along with the box it came in.

This confirms the 80psi for the oil gauge.

[Bruce Parker (RIP)]

Originally Posted by Jordan Baker

Here is an NOS glass (GM 1566971) for the Otter and others that shared the same part number along with the box it came in.

This confirms the 80psi for the oil gauge.

"QTY. 2" They just KNOW you are going to break one installing it...