New to me race car has a 4AN schrader valve tee'd into the fuel line for fuel sampling.
My Googling is failing to find a valve that will connect up to get the sample. Don't see anything at Pegasus, Summit, Speedway, etc. 
I need something like this that fits 4AN, one pictured fits a normal schrader:
Aircraft spruce?
4an with a valve is the standard GM fuel pressure test port. Anything that connects to a GM fuel rail (and some other American cars) for reasons of checking fuel pressure will work.
What are the male fitting threads? Looks like 1/8npt which is super common.
In reply to Ranger50 :
I think it is 1/8 npt.
I punted and ordered a spring style test port with 1/8 npt to replace the 4an fitting.
Didnt find anything at aircraft spruce.
Pick up an old set of R-12 A/C gauges. That is what they are. The low side gauge and hose is perfect. Or, The Hammer Store has a fuel pressure the kit with that fitting.
https://www.harborfreight.com/fuel-injection-pump-tester-58760.html
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