Port Thread Size

[cheesy]

I'm getting ready to do the electric and hydraulics diagnostics on the 48 Desoto transmission and need to know the test port thread size for the pressure gauge. Not seeing a reference in the service manual. I'm guessing it's not 1/4 NPT. Possibly 3/8 NPS or SAE?

 

Thanks in advance.

[Plymouthy Adams]

likely a 1/8 NPT....tubing is usually 3/8-24

[cheesy]

Thanks.