Factory tranny line with test port size

[BgBlDodge]

I'm running the factory tranny line from a 12v that has a port in it. I'm trying to install my new tranny temp gauge but can't remember the size of the port and I need some adapters because the new sender is 1/8" npt. I think it's 1/2"npt but not sure. Anyone know? Thanks.

 

[massdiesel]

1/4 npt

 

[rockjeep73]

I think I remember it being 3/8 npt, but I could be wrong.

 

[BgBlDodge]

Thanks boys.

 

[BgBlDodge]

Well it ain't 1/4 npt. It's at least 3/8npt. Lukcily I had a fitting lying around. Not sure on it's size but if I had to guess it would be 3/8-1/2npt.