Source for fuel rail schrader valve fitting

[Wile E Coyote]

Looking for an adapter that will allow me to get from 1/4" NPT threaded hose, to the common fuel rail schrader valve fittings. Those fuel rail fittings look very much like R-12 system fittings. Regular air chucks don't fit. I've been poking around Mcmaster-Carr with no luck, but I don't know my way around that site.
(I'm wanting to use my engine/trans oil pressure tester as a fuel pressure tester.)
Just a cheap a$$ trying to get out of $44 for a specific tester.
Any held appreciated.

 

[2mbb]

Here's something: https://www.casperselectronics.com/...OD&Product_Code=107133&Category_Code=newitems

Also try searching "schrader" on summitracing or jegs.

 

[Wile E Coyote]

Ah, you da man! I poked around for a while before posting to 'Mud.
Those look like what I'm after.
Thanks.