schrader valve thread size?

[mr.b]

what is the thread size of the schrader valve. going to put a gauge their and need an adapter.

 

[jrichker]

!/16" pipe thread, Autometer has the adapter on their website.
http://www.autometer.com/cat_accessories.aspx?sid=36

Autometer P/N 3280

1/16" NPT Male to 1/8" NPT Female adapter for fuel rail. For use with Electric or Mechanical Fuel Pressure Gauges.