I think Rodger hit upon what I was looking for but I found this which pretty much explains it.
http://www.chevellestuff.com/tech/an_fittings.htm
Basically, I want to pull a schraeder valve from a fuel rail and run a Fuel Pressure gauge on the rail. The schraeder valve is 1/16" male NPT and the Fuel Pressure Gauge runs a 1/8" female NPT. I was trying to locate a 45* aluminum adapter rather than a straight brass one.
John