(Autometr)what fitting for elec. fuel pressure guage?

[cobra dave]

Does anyone know what size NPT fitting is needed to connect the sending unit to the fuel rail. I'm trying to hook up an autometer electric fuel pressure guage.

 

[Mustang928]

Its Nitrous part# NOS-16785

Brothers sells them..

http://www.brothersperformance.com/shop/mustang/nos16785.html