I just ordered a set of guages from Dielsel Manor. I got the ISSPRO 3 guage with boost/Pyro/trans temp. I have searched on here and can not find what size the transmission cooler line is so I can by the appropriate Cooler Line Manifold. By looking at it if figured 3/8 but not for sure. What is everyones take on this temp?

 

Diesel Manor sells what you need... call em'.

 

The hot line Ibelieve is 1/2-inch.

 

The line is 1/2. I used -8 an tube nuts/sleeves from summit and put my adpt. in. It cost about $30 to make.

 

It's 1/2" O.D. in the hard line. You can go cheap with compression fittings. They work but will eventually leak, ( I had it happen) don't take too repeated heat cycle expansion/contraction. Do it right the first time and use JIC flare fittings or whatever you call them in your neck of the woods.Diesel manor sells the complete line. Save the hassle!